Joan bought a calculator at a discounted price that was 30 percent less than the original price. If the discounted price of the calculator was $105, what was the original price?

A) $75

B) $120

C) $135

D) $150

E) $195
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If we let n = the original price of the calculator, we see that 0.7n is the discounted price. We can create the equation:

0.7n = 105

n = 105/0.7 = 150

Answer: D
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