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Abigail used to save 40% of her salary in 2013. Her salary increased b

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Bunuel
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Abigail used to save 40% of her salary in 2013. Her salary increased b [#permalink] New post   05 Nov 2019, 01:35
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Abigail used to save 40% of her salary in 2013. Her salary increased by 100% in 2014 and by 50% in 2015, but her expenses remained the same throughout. What was the percentage increase in her annual savings over the two years?

A. 200%
B. 240%
C. 300%
D. 500%
E. 600%


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D
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Re: Abigail used to save 40% of her salary in 2013. Her salary increased b [#permalink] New post   05 Nov 2019, 04:15
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IMO D 500%
Year | Salary | Saving
2013 | 100 | 40
2014 | 200 | 140
2015 | 300 |240

Savings went from 40 to 240 in 2 years.

Increase/Change in saving over 2 years= 200
Base =40

Percent increase = \(\frac{Change}{Base}*100\)= \(\frac{40}{200}*100\) =500%

Hence D
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Re: Abigail used to save 40% of her salary in 2013. Her salary increased b [#permalink] New post   11 Nov 2019, 14:32
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Bunuel wrote:
Abigail used to save 40% of her salary in 2013. Her salary increased by 100% in 2014 and by 50% in 2015, but her expenses remained the same throughout. What was the percentage increase in her annual savings over the two years?

A. 200%
B. 240%
C. 300%
D. 500%
E. 600%


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We can let Abigail’s salary in 2013 be $100. Thus, she spent $60 and saved $40. In 2015, her salary was 100 x 2 x 1.5 = $300. Since she still spent $60, she saved $240. Therefore, the percent increase in her annual savings over the two years was:

(240 - 40)/40 x 100 = 5 x 100 = 500

Answer: D
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Re: Abigail used to save 40% of her salary in 2013. Her salary increased b [#permalink] New post   28 Feb 2022, 10:00
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Bunuel wrote:
Abigail used to save 40% of her salary in 2013. Her salary increased by 100% in 2014 and by 50% in 2015, but her expenses remained the same throughout. What was the percentage increase in her annual savings over the two years?

A. 200%
B. 240%
C. 300%
D. 500%
E. 600%


2013

Salary = 100 ; Savings = 40 ; Expenses = 60

2014

Salary = 200 ; Savings = 140 ; Expenses = 60

2015

Salary = 300 ; Savings = 240 ; Expenses = 60

Thus, the percentage increase in her annual savings over the two years is -

\(\frac{(240 - 40)}{40}*100 = 500\), Answer must be (D)
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Re: Abigail used to save 40% of her salary in 2013. Her salary increased b [#permalink]
28 Feb 2022, 10:00
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