i do not understand how more than 1500 units are produced if it says the company only has 1500 hours

Product DGH has a monthly demand of 5,000 units. Its contribution margin is $18 per unit and $36 per direct labor hour. Product RBG has a monthly demand of 4,000 units. It's contribution margin is $15 per unit and $60 per direct labor hour. If the company only has 1,500 direct labor hours available, the company should produce 1000 units of Product DGH and 4000 units of Product RBG. Blank 1 Blank 2 (Enter your answers as whole numbers.) Correct Answer Blank 1: 1,000 Blank 2: 4,000