A firm must decide whether to provide their salespeople with firm-owned cars or to pay a mileage allowance for their own cars. New cars would cost about $28,000 each and could be resold 4 years later for about $11,000 each. Annual operating costs would be $1200 per year plus $0.24 per mile. If the salespeople drove their own cars, the firm would pay $0.50 per mile. Assume a 10% annual interest rate.
How many miles must each salesperson drive each year for it to be economically practical for the firm to provide the cars?