Could you please find a solution for problem1 part(b) on excel and with excel formulas

Problem 1: . The plant manager at a company would like to perform an analysis for a new $250,000 machine. She estimates benefits of $20,000 in the first year, and benefits are increasing by 10% per year. (a)What is the payback period for the machine? (b)Suppose that the machine life is 15 years and machine has a salvage value of 20% of the initial cost at the end of its useful life. If the MARR of the company is 11 % per year, is this investment acceptable? Why? . Problem 2: (Exercise 6.4 is modified)