Question 4 A firm decides to invest x units of capital in project A and y units in project B. The expected return for one unit of investment is $400 in project A and $800 in project B. However, to meet the expectations of the firm's ethical and environmental policy the values of x and y must satisfy the constraint x + y2 - 4x - y = 195 How many units of each type should the firm buy in order to maximize total return