F2

variable production cost per unit $A=70 ,B=70 ,C=75 ,D=85
purchase price per unit from another supplier $A=108 ,B=130 ,C=120 ,D=124
skilled labour hours per unit to manufacture A=4 ,B=6 C=5 ,D=3

as it has insufficient skilled labour hours available to manufacture all the components required , the company will need to buy some units of one component from the other supplier.

which component should be purchased from the other supplier?