Birch manufacturing is considering the addition of another product line to its offerings. Equipment needed to produce the new line will cost $212,310. Birch estimates that the net cash inflows from the new product line will be as follows: Years 1-10 Years 11-15 Year 16-20 $19,620 (each year) $5.370 (each year) $2,040 (a) What is the payback period for the new product line? Payback period years