The Used Books Emporium is having a big sale, where the prices of all the books in stock are discounted by the same percentage. If a book that originally cost $/$15$ is now being sold for $/$4$, how many dollars will a book that was originally $/$21$ sell for? Express your answer as a decimal.

Question

Octavio

Mathematics

7 April, 09:42

The Used Books Emporium is having a big sale, where the prices of all the books in stock are discounted by the same percentage. If a book that originally cost $/$15$ is now being sold for $/$4$, how many dollars will a book that was originally $/$21$ sell for? Express your answer as a decimal.

+3

Answers (2)

Know the Answer?

Denise Norton · Answer 1

5.60

Step-by-step explanation:

Let p equal the new price, in dollars, of the book that originally cost $21. Since we know that the prices of both books are discounted by the same percentage, we can set up the ratio p/21 = 4/15

So,

p = 4/15*21

and p=5.60

Paityn Carney · Answer 2

Your total I'll be $9.46