EXPLANATION
Let's see the facts:
Sales tax: 8%
Cost per DVD= $7.5
Total cost = Cost per DVD + Cost per DVD* Sales tax (in decimal form)
Total cost = 7.5 + 7.5*(8/100) =
Total cost = 7.5 + 7.5 * (0.08)=
Multiplying terms:
Total cost = 7.5 + 3/5
Adding numbers:
Total cost = 8.1
The answer is $8.1.