2007 AMC 12A Problem 5

Attempt Problem 5 of the 2007 AMC 12A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2007 AMC 12A solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

5.

Last year Mr. John Q. Public received an inheritance. He paid 20%20\% in federal taxes on the inheritance, and paid 10%10\% of what he had left in state taxes. He paid a total of $10,500\$10{,}500 for both taxes. How many dollars was the inheritance?
30,00030{,}000
32,50032{,}500
35,00035{,}000
37,50037{,}500
40,00040{,}000
Answer: D
Concepts:percentagework backwards
Small hint:
After the 20%20\% federal tax, 80%80\% remains; the state tax is 10%10\% of that
Big hint:
The two taxes together are 20%+8%=28%20\%+8\%=28\% of the inheritance
Solution:
After federal taxes, Mr. Public keeps 80%80\% of his inheritance.
He pays 10%10\% of that in state taxes, which is 8%8\% of the inheritance.
His total tax is 20%+8%=28%20\%+8\%=28\% of the inheritance, so the inheritance is $10,5000.28=$37,500.\frac{\$10{,}500}{0.28}=\$37{,}500.
Thus, the correct answer is D.
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