Please Show what formulas you use!

You are given the following financial data about an assembly machine to be implemented at a company 1. Investment cost at n-0: $22,000 Investment cost at n-l: $18,500 Useful life: 15 years Salvage value (at the end of 15 years): $7,000 Annual revenues: $18,000 per year Annual expenses: $5,000 per year MARR: 10% . . Assuming the first revenues and expenses will occur at the end of year 2. a) Draw the cash flow diagram. b) Determine the conventional payback period