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# A store's monthly sales total declined j percent from October to Novem

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Manager
Joined: 03 Jul 2017
Posts: 69
Location: India
Concentration: Finance, Economics
GPA: 3.4
A store's monthly sales total declined j percent from October to Novem  [#permalink]

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Updated on: 21 Nov 2017, 13:21
1
00:00

Difficulty:

55% (hard)

Question Stats:

66% (02:20) correct 34% (02:14) wrong based on 68 sessions

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A store's monthly sales total declined j percent from October to November. If the store's total sales in December were equal to its total sales in October, by what percent, in terms of j, did the store's sales increase from November to December?

A. j

B. $$\frac{100j}{100+j}$$

C. $$\frac{10,000j}{100-j}$$

D. $$\frac{100j}{100-j}$$

E. $$\frac{j}{1-j}$$

Originally posted by abansal1805 on 21 Nov 2017, 11:19.
Last edited by abansal1805 on 21 Nov 2017, 13:21, edited 1 time in total.
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Re: A store's monthly sales total declined j percent from October to Novem  [#permalink]

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21 Nov 2017, 12:29
If we take an arbitrary value for j = 20.
Assuming the store's monthly sales for October to be 1000.
Hence, the sale in November is 800.
If the sales in December was the same as that of October,
we would need an increase of 200, and the increase will be $$\frac{200}{800}*100 = 25$$%

When we substitute the value of j=20, Option D($$\frac{100j}{100-j}$$) gives the correct answer

abansal1805 IMO the OA must be D, not C. Please check!
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Manager
Joined: 03 Jul 2017
Posts: 69
Location: India
Concentration: Finance, Economics
GPA: 3.4
Re: A store's monthly sales total declined j percent from October to Novem  [#permalink]

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21 Nov 2017, 13:23
Dear pushpitkc,
You are correct. Thank you for pointing out the error.
It has been fixed.
Much appreciated.
Intern
Joined: 30 Sep 2014
Posts: 3
A store's monthly sales total declined j percent from October to Novem  [#permalink]

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27 Nov 2017, 10:32
pushpitkc wrote:
If we take an arbitrary value for j = 20.
Assuming the store's monthly sales for October to be 1000.
Hence, the sale in November is 800.
If the sales in December was the same as that of October,
we would need an increase of 200, and the increase will be $$\frac{200}{800}*100 = 25$$%

When we substitute the value of j=20, Option D($$\frac{100j}{100-j}$$) gives the correct answer.

j=20, Option D($$\frac{100(20)}{100-20}$$) does not equal 1/4. I'm confused.

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Joined: 16 Aug 2016
Posts: 15
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GMAT 1: 460 Q35 V19
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WE: Brand Management (Retail)
Re: A store's monthly sales total declined j percent from October to Novem  [#permalink]

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03 Dec 2017, 21:55
Lateralus14 wrote:
pushpitkc wrote:
If we take an arbitrary value for j = 20.
Assuming the store's monthly sales for October to be 1000.
Hence, the sale in November is 800.
If the sales in December was the same as that of October,
we would need an increase of 200, and the increase will be $$\frac{200}{800}*100 = 25$$%

When we substitute the value of j=20, Option D($$\frac{100j}{100-j}$$) gives the correct answer.

j=20, Option D($$\frac{100(20)}{100-20}$$) does not equal 1/4. I'm confused.

Hi Lateralus14, the question is asking for percentage increase, and hence the 100. If you're solving it with fraction, then 100 has to be omitted from the calculation.

So, $$\frac{100*(20)}{(100-20)}$$ will become $$\frac{20}{80}$$*100, or $$\frac{1}{4}$$*100 or 25% increase.

Hope this clears the confusion.
Re: A store's monthly sales total declined j percent from October to Novem &nbs [#permalink] 03 Dec 2017, 21:55
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