b) There are 3 commodities X, Y, Z. Mr. A purchases 4 unit of Z and sells 3 units of X and 5 units of Y. Mr. B purchased 3 units of Y and sells 2 units of X and 1 unit of Z. Mr. C purchased 1 unit of X and sells 4 units of Y and 6 units of Z. In this process Mr. A, B, C get Rs. 600, Rs. 500 and Rs. 1300 respectively. Find the price per-unit of each item. [4] birouly​