the mangers of united medtronics are evaluating the following four projects for the coming budget period. the firm's corporate cost of capital is 14 percent. project ____ cost ____ IRR A _____ $15,000 ___ 17% B _____ 15,000 ____ 16 C _____ 12,000 ____ 15 D _____ 20,000 ____ 13 a. what is gthe firm's optimal capital budget? b. now, suppose Medtronics's managers want to consider differential risk in the capital budgeting process. project A has average risk,B has below average risk, C has above average risk and D has average risk. what is the firm's optimal capital budget when differential risk is considered? (hint: the firm's managers lower the IRR of high risk projects by 3 percentage points and raise the IRR of low risk projects by the same amount.,)