10. To get the volume of the tank, mulitply all the sides together
(10)(15)(8) = 1200 cubic inches
95% of 1200, or 1200 × .95 = 1140, is 1140 cubic inches
11. 15.95 - (15.95 × .15) = 13.56
12. 89.99 - (89.99 × .20) = 71.99
13. 1.25 × 500 = 625. The number is greater because the percentage is over 100%