solve both a and b please

Consider two mutually exclusive investment alternatives given in the table below. Click the icon to view the cash flows for the projects (a) Determine the IRR on the incremental investment in the amount of $4,000. (Assume that MARR = 7%.) The rate of return on the incremental investment is (%. (Round to two decimal places.) x i More Info (b) If the firm's MARR is 7%, which alternative is the better choice? Choose the correct answer below. Project A1 Project A2 o n 0 1 Net Cash Flow Project A1 Project A2 - $16,000 - $20,000 $6,500 $4,000 $6,500 $13,000 $6,500 $7,000 10.58% 9.04% 2 3 IRR Print mint Do Done