LUTET Atempem progress Sheridan manufacturing is considering the addition of another product line to its offerings. Equipment needed to produce the new line will cost $228,000. Sheridan estimates that the net annual cash inflows from the new product line will be as follows: Years 1-10 Years 11-15 Year 16-20 $20.520 $5,700 $2.280 (a) What is the payback period for the new product line? (Round answers to decimal places, es.25.) Payback Period years