A book was on sale for 40% off its original price. If the sale price of the book was $18.00, what was the original price of the book? (Assume there is no sales tax.)
Correct answer: C. $30.00
- A. $7.20
- B. $10.80
- C. $30.00
- D. $45.00
Explanation
Choice C is correct. Let x represent the original price of the book. Then, 40% off of x is (1 − 0.40)x, or 0.60x. Since the sale price is $18.00, then 0.60x = 18. Dividing both sides of this equation by 0.60 yields x = 30. Therefore, the original price of the book was $30.
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