When production in the economy changes from A (10,50) to B (12,40), MRT of the economy is (a) 5 units of Y are to be sacrificed for an additional unit of X (b) 5 units of X are to be sacrificed for an additional unit of Y (c) 1 Unit of Y is to be sacrificed for 5 units of X (d) 1 Unit of X is to be sacrificed for 5 units of Y Due