A library shelving system has a first cost of \(\$ 20,000\) and a useful life of 10 years. The annual maintenance is expected to be \(\$ 2,500\). The annual benefits to the library staff are expected to be \(\$ 9,000\). If the effective annual interest rate is 10 percent, what is the benefit/cost ratio of the shelving system?

a. 1.51

b. 2.24

c. 1.73

d. 1.56