A steel company produces two types of machine dies, part A and part B. the company makes a $3.00 profit on each part A that it produces and a $6.00 profit on each part B that it produces. Let x = the number of part a produced in a week and y = the number of part b produced in a week. Write the objective function that describes the total weekly profit.
A = z=3(x-6)+6(y-3)
B = z=6x+3y
C = z=3x+6y
D = z=9(x+y)