Answer:
When [tex]n\geq 50= 25n-80[/tex]
Step-by-step explanation:
If [tex]n\geq 50= 25n-80[/tex]
If the school buys n books, they purchase each book for $25, so that would be 25n
Since they're buying more than 50 books, they get a discount of $80.
So when n is greater or equal to than 50, they get a discount. which gives the expression [tex]n\geq 50= 25n-80[/tex]