Ghacem, a monopolist in the production of cement produces two the Rapid Grade (Product A) and Super Rapid (product B). The joint-cost function is C=5qA+3qB+5000 where c c is the total cost of producing qA units of A and qB units of B. The demand functions for these products are given by PA=205- 2qA-qB and PB=153-qA-qB where PA and PB are the prices of A and B, respectively. Find the number of units of B that Ghacem should produce to maximize the monopolist's profit