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After being marked down 20 percent, a calculator sells for $10. The original ... ...

After being marked down 20 percent, a calculator sells for $10. The original selling price was
(A)    $20
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set M: Elimination Strategies

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Posted: 09/19/2012 08:56
That is the answer 12, so how can the answer be 12.5?
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Posted: 09/19/2012 17:47
Hi Thad,

Original Price = P. Discounted Price = DP = $10. Discount = 20%
DP = P - P*20%
DP = P * (1-20*) = 80% * P = 10
P = 10 div by 80% = 10 * 100 / 80 = not 12, but the answer is ...
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