A rental store charges a fine of 25 percent of the usual full-day rental rate for each hour that an item is late. Ryan rented a rototiller for one day for \(\$40\). He returned it 3 hours late. How much was his total bill for the rental and the fine?

Explanation

The rental fee was \(\$40\). For each hour that the return was late, a charge equal to 25% of the rental fee, which is \(\frac{1}{4}\) of \(\$40\), or \(\$10\), was made. Since the rototiller was returned 3 hours late, the late fee was \(3 \times \$ 10=\$ 30\). The rental fee plus the late fee was then \(\$ 40+\$ 30=\$ 70\)