MAProduction

A company has only 4000 labour hours available for production in the next period and the following information is available: Product ------------------------------------------------Q-------R-------S Maximum demand for next period (units)---500----500----500 Contribution per unit ($) --------------------------- 24---34------40 Labour hours per unit ---------------------------------2---3---------5 The company holds no inventories. If the company plans production to maximise profits, which TWO of the following statements are correct in respect of next period's production: a) Produce no Q, 500 units of R and 500 units of S b) Produce 500 units of Q, 500 units of R and 300 units of S c) Max contribution will be 39,000 d) Max contribution will be 37,000 I need help with this question !