Question

Suppose a student enters a college bookstore to buy an introductory calculus textbook. The book costs $180. This is 225% of what a similar textbook would have cost in 1996. Find what that cost was.

Answer 1

$80

Step-by-step explanation:

We know that $180 represents 225% of the cost of a similar textbook in 1996, then we can calculate the 100% of the cost as follows

`100\text{ \%}*\frac{180}{225\text{ \%}}=\frac{100\text{ \%}*180}{225\text{ \%}}=80`

Therefore, the cost was $80