In Class #3.1 Just Cool It Company, a wholesaler of large, custom-built air conditioning 1 buildings, has noticed considerable fluctuation in its shipping expense from shown below: Month Units Total Shipping shipped Expense January 4 $2,200 February 2 $3,100 March 5 $2,600 April 2 $1,500 May 3 $2,200 J1me 6 $3,000 July 8 $3,600 mm Using the highlow method, estimate the cost formula for shipping expense