4) A factory worker is loading two types of cartons onto a freight elevator. Type A cartons weigh 85 pounds a piece.
Type B cartons weigh 80% of Type A cartons. The maximum weight the elevator can carry is 1,500 pounds.
Which inequality represents all the possible combinations of x, the number of Type A cartons and, y, the number
of Type B cartons, and the total weight that the elevator can carry?
A) 85x + 68y = 1,500 B) 85x + 80y >1,500 C) 85x + 68y < 1,500 D) 85x + 80y < 1,500