10. a decision maker is choosing the levels of two activities, x and y, so as to maximize total benefits under a given budget. the prices and marginal benefits of the last units of x and y are denoted p, p, mb, and mb. a. if p $30, p. $40, mb 420, and mb. 640, what should the decision maker do? b. if p. $15, p. $17.50, mb. 750, and mb, 840, what should the decision maker do? c. if p. $56, p. $14, mb. 2,800, and mb, 1,050, how many units of y can be obtained if x is reduced by one unit? how much will benefits increase if this exchange is made? d. if the substitution in part c continues until the point of equilibrium is reached, and mb rises to 3,360, then what will mb, be in equilibrium?
