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MONTHLY KILOWATT-HOURS 500 1,000 1,500 2,000 Present $24.00

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MONTHLY KILOWATT-HOURS 500 1,000 1,500 2,000 Present $24.00 [#permalink] New post 15 Oct 2005, 21:51
MONTHLY KILOWATT-HOURS
500 1,000 1,500 2,000
Present $24.00 $41.00 $57.00 $73.00
Proposed $26.00 $45.00 $62.00 $79.00



12. The table above shows present rates and proposed rates for electricity for residential customers. For which of the monthly kilowatt-hours shown would the proposed rate be the greatest percent increase over the present rate?
(A) 500
(B) 1,000
(C) 1,500
(D) 2,000
(E) Each of the percent increases is the same.
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 [#permalink] New post 15 Oct 2005, 22:36
Hard to understand whether the kilowatt-hours plays a role in the comparison. Even if we set 6000 KW as a common base, it does`t effect the percent increase difference.

A. 26-24=2 ---> 2/24=1/12
B. ...4/41= approx 1/10
C. ...5/57= approx 1/11
D. ...6/73= approx 1/12

Greatest increase is B.

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 [#permalink] New post 15 Oct 2005, 22:39
Answer is B

Here are the increase percentages:

Formula: Increase percentag = (amount increased / original amount ) * 100%

Hence,

2/24 = 1/12
4/41 = 1/10.25
5/57 = 1/11.4
6/73 = 1/12.16

The lower the denominator, the higher the increase. Hence B
  [#permalink] 15 Oct 2005, 22:39
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MONTHLY KILOWATT-HOURS 500 1,000 1,500 2,000 Present $24.00

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