Ted bought 3 books at m dollars each. The sales tax on his purchase was %5 of the cost of the books. Which of the following expresses the total cost of his purchase?
The total cost of Ted's purchase can be expressed as:
Total cost = Cost of books + Sales tax
Total cost = 3m + 0.05(3m)
Total cost = 3m + 0.15m
Total cost = 3.15m
Therefore, the total cost of Ted's purchase is 3.15m.