A construction company is planning to purchase a new Backhoe. Most likely estimates are a first cost of $50,000, $20,000 Salvage value and a before-tax cash flow relation of the form NCF = $-45,000+6,000t per year (t=1, 2, . . . , 10)and NCF= 80,000-5000t per year (t=12,13, . . ., 18). The MARR for the company varies from 5% to 30% per year for different types of backhoe investments. The economic life of similar equipment varies from 6 to 15 years. Evaluate the sensitivity of PW and AW by varying:

A) The parameter of MARR while assuming a constant n=10 years

B) The parameter n, while MARR is constant at 10%