A firm produces products A, B and C with contribution margins of $4, $5 and $8 respectively. The firm has only 10000 machine hours available for a particular period. Machine hours required for each of the products are 2, 2 and 5 hours respectively. Demand for the products is 2000 for A, 3000 for B and 1000 for C. How many units of each product should the firm produce to maximise profits? Select one or more: a. 5000 B b. 2000 A and 3000 B c. 1000 A, 2000 B and 800 C d. 3000 A and 2000 B e. 2000 C