Grover Company has the following data for the production and sale of 1,600 units. per unit Sales price $ 850per unit Fixed costs: Marketing and $570,000 per administrative period Manufacturing$288,000per overhead period Variable costs: Marketing and $ 60per administrative unit Manufacturing 90per overhead unit Direct labor $ 110per unit Direct $ 210per Materials unit What is the prime cost per unit? Select one: O a. $590 O b. $300 O c. $320 O d. $110