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And this means that her annual savings = 12fM

Important: If f = the fraction used to calculate monthly savings, then 1-f = the fraction used to calculate amount not saved
The means that (1-f)M = the amount of \$ Alice does not save each month.

Now we're ready to write an equation.

The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take home pay that she did not save.
We get: 12fM = 3(1-f)M
Now solve for f
Expand to get: 12fM = 3M - 3fM
Simplify: 15fM = 3M
Divide both sides by 15M to get: f = 3M/15M = 1/5 = D

Cheers,
Brent

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Brent Hanneson â€“ Founder of GMATPrepNow.com
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GMAT/MBA Expert

Matt@VeritasPrep GMAT Instructor
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Thu Nov 09, 2017 6:03 pm
This one has always bugged me, as "the amount of her take-home pay that she didn't save" seems too vague. (Are we talking monthly or yearly?) OfficialGMAT, any comment on this? Feels like it should be revised.

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