What amount of money deposited $40$ years ago at $5\%$ interest would A provide a perpetual payment of $$50,000$ a year beginning this year?$-42$

A

$$8000$ salvage value. At the end of $9$ years, it will need a major overhaul costing $$19,000.$ Annual maintenance and operating costs are $$9000.$ The Sno$-$Mover will cost $$50,000,$ has an expected life of $10$ years, and has no salvage value. The annual maintenance and operating costs are expected to be $$12,000.$ Using a $12\%$ interest rate, which machine should be chosen?