Points: 0 of 1 Save A company produces two models of a surfboard: a standard model and a competition model. If the standard model is produced at a variable cost of $200 each and the competition model at a variable cost of $300 each, and if the total fixed costs per month are $7,000, then the monthly cost function is given by ed: C(x,y) =7,000 + 200x + 300y where x and y are the numbers of standard and competition models produced per month, respectively. Find C(18,9), C(50,5), and C(30,30). core