Suppose a pizza parlor has the following production​ costs: ​$3.00 in labor per​ pizza, ​$1.00 in ingredients per​ pizza, ​$0.90 in electricity per​ pizza, ​$3,500 in restaurant rent per​ month, and ​$200 in insurance per month. Assume the pizza parlor produces 3,000 pizzas per month. What is the variable cost of production​ (per month)?