How many cassettes will a salesperson need to sell to make 7

How many cassettes will a salesperson need to sell to make $73.50 in commission if the commission rate is 7% and the cassettes sell for $15 apiece?

Solution

commission for 1 cassette = 15 * 7 / 100 = 1.05

Total commission = 73.5

Number of cassettes = Total commission / commission for 1 cassette

                                  = 73.5 / 1.05

                                  = 70 (ans)

So, 70 cassettes will a salesperson need to sell to make $73.50 in commission