Question 7 (5 points) You are considering four cost-reduction alternatives in your business. You have already had the information about the rates of return for these projects, along with some incremental rates of return: Incremental Investment Incremental Rate of Return (%) 18% 23% 17% X1 - X0 X2 - 20 X3 - 20 X4 - Xo X2 - X1 X3 - X1 X4 - X1 X3 - X2 X4 - X3 X4 - X2 11% 30% 21% 27% 18% 19% 15% XO denotes the do-nothing alternative. The required investments are $420,000 for X1, $550,000 for X2, $720,000 for X3, and $800,000 for X4. If the MARR is 20%. what system should be selected