Summit has Rs 90 with him. He intends to purchase goods X and Y with his money. The market price of X and Y per unit is Rs 10. The marginal utility schedule of goods X and Y is given below. Find out how many units of X and Y should summit purchase so that he gets maximum satisfaction.

Units of 1 2 3 4 5 6 7 8 9 10

Commodity

Mu of X 80 72 64 56 48 40 32 24 16 8

Mu of Y 40 32 24 20 16 12 8 4 0 0