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A bookstore sells used books at a 40$\%$ discount off the regular price of the book when it was new. The price of a used book is $\$18$. What was the regular price of that book when it was new

 Jul 14, 2020
 #1
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40% discount means that the discounted price is 60% of the original. After discount, the used book is $18, which is 60% of its original price, x. We form an equation:

 

18=60/100(x)

1800=60x

x=$ 30

 Jul 15, 2020

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