please work out, do not use excel

6. A contractor is considering whether to buy or lease a new machine for her layout site work. Buying machine's useful life of 8 years. On the other hand, leasing requires an annual lease payment of $3,000, which occurs at the start of each year. The MARR is 15 %. On the basis of an internal rate of return analysis, which alternative should the contractor be advised to accept? a new machine will cost $12,000 with a salvage value of $1,200 after the