Question

A toy store has requested a manufacturer to produce zombies and robots. For materials, the manufacturer has 750 units of green plastic and 1000 units of
brown plastic. Every robot needs 1 unit of green and 2 units of brown. Every zombie needs 3 units of green and 2 units of brown plastic. The price of the zombie is fixed at $50 and the robots $40. What is the number of zombies the robots that the manufacturer must give to the stores so that these items obtain a maximum sale? Define your unknowns. write the objective function.