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Magoosh GMAT Instructor
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ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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25 Sep 2013, 10:55
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77% (02:47) correct
23% (01:56) wrong based on 242 sessions
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Without a calculator, solve this problem in 90 seconds. ACME’s manufacturing costs for sets of horseshoes include a $11,450 initial outlay, and $19.75 per set. They can sell the sets $52.50. If profit is revenue from sales minus manufacturing costs, and the company produces & sells 987 sets of horseshoes, what was their profit? (A) $20,874.25 (B) $30,943.25 (C) $41,308.50 (D) $51,817.50 (E) $53,624.25 For a discussion of the valuable skill of estimation on the GMAT Quant section, as well as an efficient solution to this problem, see: http://magoosh.com/gmat/2012/thepower ... matquant/Mike
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Re: ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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26 Oct 2013, 08:15
mikemcgarry wrote: Without a calculator, solve this problem in 90 seconds. ACME’s manufacturing costs for sets of horseshoes include a $11,450 initial outlay, and $19.75 per set. They can sell the sets $52.50. If profit is revenue from sales minus manufacturing costs, and the company produces & sells 987 sets of horseshoes, what was their profit? (A) $20,874.25 (B) $30,943.25 (C) $41,308.50 (D) $51,817.50 (E) $53,624.25 For a discussion of the valuable skill of estimation on the GMAT Quant section, as well as an efficient solution to this problem, see: http://magoosh.com/gmat/2012/thepower ... matquant/Mike Their profit was 987*(52.519.75) 11.450 ~1000*32 11,500 ~ 20,000. The answer is A



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Re: ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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05 Nov 2013, 03:18
mikemcgarry wrote: Without a calculator, solve this problem in 90 seconds. ACME’s manufacturing costs for sets of horseshoes include a $11,450 initial outlay, and $19.75 per set. They can sell the sets $52.50. If profit is revenue from sales minus manufacturing costs, and the company produces & sells 987 sets of horseshoes, what was their profit? (A) $20,874.25 (B) $30,943.25 (C) $41,308.50 (D) $51,817.50 (E) $53,624.25 For a discussion of the valuable skill of estimation on the GMAT Quant section, as well as an efficient solution to this problem, see: http://magoosh.com/gmat/2012/thepower ... matquant/Mike Hi Mike, I followed the link be I didn't understand the concept as to when do you round up and when do you round down? When you rounded 11450 to 10000 it seems like a lot to round down. I thought that once you did that, you would round both the other number up to account for it. Does it even matter? How do you choose?



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Re: ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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05 Nov 2013, 12:40
ronr34 wrote: Hi Mike, I followed the link be I didn't understand the concept as to when do you round up and when do you round down? When you rounded 11450 to 10000 it seems like a lot to round down. I thought that once you did that, you would round both the other number up to account for it. Does it even matter? How do you choose? Dear ronr34, As with many things with numbers, you need to develop number sense. Here's a blog about it http://magoosh.com/gmat/2012/numbersenseforthegmat/Developing number sense takes time. The more you do math without any calculator, the more your intuition for numbers will develop. When I estimate, I often try to make things as simple as possible. Numbers with only one nonzero digit are very simple  that's a good target for GMAT estimation. Starting with 11,450, the closest number with only one nonzero digit is 10,000. Usually, on GMAT questions, that's a fine level for estimation. It's very convenient, because even if you have to multiply, it's just onedigit arithmetic with some zeros stuck at the end.  If you can compensate a roundup with a rounddown, that can help, but often even that is not necessary, especially if the answer choices are very far apart. Does this make sense? Mike
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Re: ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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07 Nov 2013, 15:02
mikemcgarry wrote: ronr34 wrote: Hi Mike, I followed the link be I didn't understand the concept as to when do you round up and when do you round down? When you rounded 11450 to 10000 it seems like a lot to round down. I thought that once you did that, you would round both the other number up to account for it. Does it even matter? How do you choose? Dear ronr34, As with many things with numbers, you need to develop number sense. Here's a blog about it http://magoosh.com/gmat/2012/numbersenseforthegmat/Developing number sense takes time. The more you do math without any calculator, the more your intuition for numbers will develop. When I estimate, I often try to make things as simple as possible. Numbers with only one nonzero digit are very simple  that's a good target for GMAT estimation. Starting with 11,450, the closest number with only one nonzero digit is 10,000. Usually, on GMAT questions, that's a fine level for estimation. It's very convenient, because even if you have to multiply, it's just onedigit arithmetic with some zeros stuck at the end.  If you can compensate a roundup with a rounddown, that can help, but often even that is not necessary, especially if the answer choices are very far apart. Does this make sense? Mike Great. I followed the link and others that were in the post. but I still sometimes, when the answers are close together and there is not big split, get confused.



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Re: ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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14 Jan 2014, 07:29
mikemcgarry wrote: ronr34 wrote: Hi Mike, I followed the link be I didn't understand the concept as to when do you round up and when do you round down? When you rounded 11450 to 10000 it seems like a lot to round down. I thought that once you did that, you would round both the other number up to account for it. Does it even matter? How do you choose? Dear ronr34, As with many things with numbers, you need to develop number sense. Here's a blog about it http://magoosh.com/gmat/2012/numbersenseforthegmat/Developing number sense takes time. The more you do math without any calculator, the more your intuition for numbers will develop. When I estimate, I often try to make things as simple as possible. Numbers with only one nonzero digit are very simple  that's a good target for GMAT estimation. Starting with 11,450, the closest number with only one nonzero digit is 10,000. Usually, on GMAT questions, that's a fine level for estimation. It's very convenient, because even if you have to multiply, it's just onedigit arithmetic with some zeros stuck at the end.  If you can compensate a roundup with a rounddown, that can help, but often even that is not necessary, especially if the answer choices are very far apart. Does this make sense? Mike Yes mike it does make sense and that is what I usually do in this case 987 = 1000 and 52.519.75 is just something near 32 And then 11,450 is just near 12,000 So everything comes near 20,000 Also when estimating it is important to try to compensate rounding and also in fractions good to know the heavy division shortcut for some problems that involve raw estimates Just my 2cents Cheers! J



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Re: ACME’s manufacturing costs for sets of horseshoes include [#permalink]
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31 Oct 2014, 10:08
approximations 19.75 = 20.00 52.50 = 50 987 = 1000 Initial cost = 20*1000 + 11450 = 31450 Selling = 50 * 1000 = 50000 Profit = 50000  31450 = 19000 close to 20k ans. A



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