For Example 4.6, determine whether the current basis would change for each of the following cases:

(a) The profit per unit of P2 increases to Rs 85, while profit per unit of P3 declines to Rs 70. What is the new optimal value of Z?

(b) The profit per unit of P1, P2 and P3 change as follows:

P1 : Rs 80 P2 : Rs 77.5 P3 : Rs 60