A store sells 12-packs of ballpoint pens for $1.09 each and composition books for $2.79 each. Cindy buys m packs of ballpoint pens and n composition books. The store offers a 5% discount for every 50th customer who makes a purchase. If Cindy gets the 5% discount, which expression will represent Cindy’s bill?

Step-by-step explanation:
A store sells 12-packs of ballpoint pens for $1.09 each.
The store also sells composition books for $2.79 each.
Cindy buys 'm' packs of ballpoint pens and 'n' composition books.
So, the equation for this becomes:
And as Cindy gets a 5% discount, so she has to pay 95% of the regular price.
Then the expression that will represent Cindy’s bill is :$1.09m + $2.79n = total
To get the percent of the total, multiply the total by 5 and move the decimal two points to the left. Subtract the number you get by the total.