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A manufacturer makes umbrellas at the cost of c dollars pe

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A manufacturer makes umbrellas at the cost of c dollars per umbrella, and sells them at the retail price of r dollars each. How many umbrellas can it afford to sell at the below-cost rate of b dollars per umbrella and still make a 100% profit on its lot of x total umbrellas?

A. \(\frac{b(2c-r)}{(x-r)}\)

B. \(\frac{2x(c-r)}{(b-r)}\)

C. \(\frac{x(2c-r)}{(b-r)}\)

D. \(\frac{2b(c-r)}{(x-r)}\)

E. \(\frac{2(xc-r)}{(x-r)}\)
[Reveal] Spoiler: OA

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Last edited by Bunuel on 27 Feb 2013, 05:53, edited 1 time in total.
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Re: A manufacturer makes umbrellas at the cost of c dollars pe [#permalink]

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emmak wrote:
A manufacturer makes umbrellas at the cost of c dollars per umbrella, and sells them at the retail price of r dollars each. How many umbrellas can it afford to sell at the below-cost rate of b dollars per umbrella and still make a 100% profit on its lot of x total umbrellas?

\(\frac{b(2c-r)}{(x-r)}\)

\(\frac{2x(c-r)}{(b-r)}\)

\(\frac{x(2c-r)}{(b-r)}\)

\(\frac{2b(c-r)}{(x-r)}\)

\(\frac{2(xc-r)}{(x-r)}\)

Let "N" be the required answer.,

(x - N)r + Nb = 2xc

xr - Nr + Nb = 2xc

N(b - r) = x(2c - r)

N = \(\frac{x(2c-r)}{(b-r)}\)

Answer is C
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process of elimination + intuition :)
x and r are not of the same nature (cost in dollar and total umbrellas) => eliminate A,D,E
now, with some intuition, if retail price is less than cost, B would be negative => eliminate B
Answer is C
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Re: A manufacturer makes umbrellas at the cost of c dollars pe [#permalink]

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emmak wrote:
A manufacturer makes umbrellas at the cost of c dollars per umbrella, and sells them at the retail price of r dollars each. How many umbrellas can it afford to sell at the below-cost rate of b dollars per umbrella and still make a 100% profit on its lot of x total umbrellas?

A. \(\frac{b(2c-r)}{(x-r)}\)

B. \(\frac{2x(c-r)}{(b-r)}\)

C. \(\frac{x(2c-r)}{(b-r)}\)

D. \(\frac{2b(c-r)}{(x-r)}\)

E. \(\frac{2(xc-r)}{(x-r)}\)


This is a tough one to use the INPUT-OUTPUT approach, but here is goes:

Let c = $2 (it cost $2 to make each umbrella)
Let x = 10 (we make 10 umbrellas)
Let r = $5 (the retail price is $5 per umbrella)
Let b = $0 (the below-cost sale price is $0 per umbrella)

So, the manufacturer made 10 umbrellas at the cost of $2 per umbrella. So the total cost = $20
We need a 100% profit. So, we must earn $40 in revenue. In other words, we must sell 8 umbrellas at $5 each.
This means we can "sell" 2 umbrellas at the below-cost sale price of $0 each.

At this point, we must plug x = 2, x = 10, r = 5 and b = 10 into each expression and see which one yields an OUTPUT of 2

A. \(\frac{b(2c-r)}{(x-r)}\) = 0 ELIMINATE A

B. \(\frac{2x(c-r)}{(b-r)}\) = 12 ELIMINATE B

C. \(\frac{x(2c-r)}{(b-r)}\) = 2 KEEP C

D. \(\frac{2b(c-r)}{(x-r)}\) = 0 ELIMINATE D

E. \(\frac{2(xc-r)}{(x-r)}\) = 6 ELIMINATE E

Answer : C

Cheers,
Brent
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Re: A manufacturer makes umbrellas at the cost of c dollars pe [#permalink]

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New post 11 Jan 2014, 08:36
emmak wrote:
A manufacturer makes umbrellas at the cost of c dollars per umbrella, and sells them at the retail price of r dollars each. How many umbrellas can it afford to sell at the below-cost rate of b dollars per umbrella and still make a 100% profit on its lot of x total umbrellas?

A. \(\frac{b(2c-r)}{(x-r)}\)

B. \(\frac{2x(c-r)}{(b-r)}\)

C. \(\frac{x(2c-r)}{(b-r)}\)

D. \(\frac{2b(c-r)}{(x-r)}\)

E. \(\frac{2(xc-r)}{(x-r)}\)


Could anybody try smart numbers on this one? I'm having a tough time coming up with the solution

Thanks!
Cheers!
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Re: A manufacturer makes umbrellas at the cost of c dollars pe [#permalink]

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New post 13 Sep 2014, 16:44
leekay wrote:
process of elimination + intuition :)
x and r are not of the same nature (cost in dollar and total umbrellas) => eliminate A,D,E
now, with some intuition, if retail price is less than cost, B would be negative => eliminate B
Answer is C

Good approach, but still I don´t understand how to choose between B and C.
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Re: A manufacturer makes umbrellas at the cost of c dollars pe [#permalink]

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Re: A manufacturer makes umbrellas at the cost of c dollars pe [#permalink]

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New post 22 Oct 2015, 11:40
MacFauz and I have demonstrated the two methods (Algebraic and Input-Output) for solving a question type I call Variables in the Answer Choices.

If you'd like more information on these approaches, we have some free videos:
- Variables in the Answer Choices - http://www.gmatprepnow.com/module/gmat- ... /video/933
- Tips for the Algebraic Approach - http://www.gmatprepnow.com/module/gmat- ... /video/934
- Tips for the Input-Output Approach - http://www.gmatprepnow.com/module/gmat- ... /video/935

Cheers,
Brent
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Re: A manufacturer makes umbrellas at the cost of c dollars pe   [#permalink] 22 Oct 2015, 11:40
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