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

Answer:

$80

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

$100\text{ \%}\times\frac{180}{225\text{ \%}}=\frac{100\text{ \%}\times180}{225\text{ \%}}=80$

Therefore, the cost was $80