I bought some shirts at the store for $9 each and receive a $25 discount by total bills $80 what mistake did deena make

I bought some shirts at the store for $9 each

and receive $25 discount.

The total b1lls is $80.

=> 80 + 25 discount = 105

since the number of shirts is not stated in the problem, we added the total bills and the discount to get the total.

So it’s 105 dollars. Now, let’s find the number of t-shirts.

=> 9 x 12 shirts = 108

=> 108 - 25 = 83, so the total bills must be 83.