6. Allen Company is considering adding bikes to their gift shop. The company estimates that the cost for the project is $18,000. Sales are expected to produce net cash inflows of $2,000 in first year, $3,000 in 2nd year, $4,000 in 3rd year, $5,000 in 4th year and $5,550 in 5th year. Required: Calculate Payback period, and should the company add bikes to their store if they assign a 4 years' maximum (desired) payback period to this project? Why or why not?