Math problem of the day

Question:
A store purchases a gadget from its suppliers for $150. Usually it is sold at a 40% retail markup. What profit will the store make if the retail price is discounted by 10%?

Answers variants: A. $39   B. $49   C. $59   D. $69   E. $79


Correct answer: A. $39
Tutorial:

The usual profit in dollars is 0.4*150 = 60, which means the usual retail price is 150 + 60 = 210. The discount is 0.1*210 = 21, so the discounted price is 210 - 21 = 189, and the profit at discount is 189 - 150 = 39 dollars.
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Corret answer is (A) - $39

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