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
[tex]100\text{ \%}\times\frac{180}{225\text{ \%}}=\frac{100\text{ \%}\times180}{225\text{ \%}}=80[/tex]Therefore, the cost was $80
