Total Sales Volume Marketing Costs January 64,500 $8,265 February 48,400 $6,605 March 69,800 $8,420 April 74,600 $8,635 May 67,300 $8,180 June 76,900 $8,885 (f) Using the original marketing cost function (($0.08 x sets sold) +$2,733) and the marketing cost function removing the potential outlier. (($0.05 x sets sold) +$5,040), which of these two cost functions would be appropriate to use in estimating future marketing costs? Why?