Bendig Middle School is selling spirit wear as a school fund-raiser. They are offering T-shirts with 3 different designs for $12.50 each. They will earn 10% of the value of the first 100 T-shirts sold, 15% of the value of the next 400 T-shirts sold, and 25% of the value of the number of T-shirts above 500 sold. Complete questions 15 below.