Everrett coffee is thinking of building a composting system for their spent coffee grounds. materials and labour to build the compost bins cost $750 the compost bins are expected to save the company $200 in trash collection services per year for the next 7 years. after that the bins will begin to break. their current cost of capital is 5% what is the payback of this project?

a. 3.75

b. 4.75

c. 5.00

d. none of these

e. 4.00