2 A monopolist has a demand function P= -BQ and an average cost function. a AC- =b+cQ Q with all coefficients > 0 and >. Find Q (output), which gives (i) maximum revenue; (ii) minimum average cost; (iii) maximum profits. 3 Maximise Z=x1x2 +2x subject to the constraint 4x+2x2 -60 0, using the method of Lagrangean multipliers.