In a hypothetical economy, no investment projects are undertaken when the real interest rate is 18 percent or above, 40 projects worth $1 million each are undertaken when the real interest rate is 15 percent, and 40 more projects worth $1 million each are undertaken every time the real interest rate falls by 3 percent until it reaches a value of zero. a. Draw a graph showing the investment demand curve. Plot 7 points in total using the line tool (investment demand curve) given below