1.Compare to units, A and B. A has a new cost of $42,000, at life expectancy of 14 years, a salvage value of $4,000, and an annual operating cost of $3,000. B has a new cost of $21,000, a life expectancy of 7 years, a salvage value of $2,000, and an operating cost of $5,000. Assume an annual interest rate of 7%. Which of the two units would you recommend? Why?
2.You wish to retire at age 66 and at the end of each month thereafter for 30 years, to receive $5000. Assume that you begin making monthly payments into an account at age 24. You continue these payments until age 66. If the interest rate is constant at 7.5% annually, how much must you deposit monthly between ages 24 and 66?