(b) Each plan requires an expenditure of money to undertake. The dif- ference between the present value and the present cost of each plan is: Plan A? Plan B? Plan C? (c) If the price of fuel is expected to remain constant, which option should he choose if he can borrow and lend at an annual interest rate of 10%? (d) Which option should he choose if he can borrow and lend at an annual rate of 5%