You will use a graph like first to help ounderstand proportional fractions
Your question is not complete but I guess you want to know the total price to be paid. This will be:
= $145 + (5.5% × $145)
= $145 + (0.055 × $145)
= $145 + $7.975
= $152.975
She got 87.5 percent. you find the answer by setting up a proportion
