Required information [The following information applies to the questions displayed below.j Archer Company is a wholesaler of custom-built air-conditioning units for commercial buildings. It gathered the following monthly data relating to units shipped and total shipping expense Units Total Shipping Shipped Month January February March April May June July Expense 2,100 2,600 2,000 2,300 2,600 3,300 1,500 2. Using the high-low method, estimate the cost formula for shipping expense riable shipping expense Fixed shipping expense per unit per month