Represent the marketing cost function in equation form. (Round variable cost to 2 decimal places, e.g. 52.75 and other answer to 0 decmial places, e.g. 5,275.) Marketing cost function $_____ sets sold + $_____

January February March April May June Sales Volume Total Marketing Costs 550,912 $82,796 390,836 $76,187 561,256 $83,004 543,000 $82,456 546,536 $82,484 552,672 $82,876