Birch manufacturing is considering the addition of another product line to its offering Equipment needed to produce the new line will cost $186.840. 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 $16,760 (each year) $4.810 each year) $2,040 (a) What is the payback period for the new product line? Payback period Attempt of used it