AbdurRakib wrote:

Andrew started saving at the beginning of the year and had saved $240 by the end of the year. He continued to save and by the end of 2 years had saved a total of $540. Which of the following is closest to the percent increase in the amount Andrew saved during the second year compared to the amount he saved during the first year?

A. 11%

B. 25%

C. 44%

D. 56%

E. 125%

I was a bit shocked at current stats of 45% incorrect.

Sometimes a simple sketch, for me, is better than an equation.

Andrew's savings from beginning to end of each year:

Year 1: 0$ ------> $240

Year 2: $240 ----> $540*

Year 1 amount saved is $240

Year 2 amt saved is (540 - 240) = $300

Percent increase =

\(\frac{change}{original}\):

\(\frac{(300-240)}{240}\) = \(\frac{60}{240}\) = \(\frac{1}{4}\) = .25 x 100 = 25%

Answer B

*

(Careful, maybe: I think it would be easy to misread "by the end of 2 years he had saved a total of $540" incorrectly as "at the end of the second year he had saved [another] $540." The latter yields answer E.)
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