managerial accounting help asap !?

atis 3A) The Ascountins Department of Archer Company, a merchandising company has Adventanng eavenie ales Per month A fabulation has been made is a mixed cost, containing both f and variable cost of billing expense and sales in units the last several months, as 330 March April 420 June 12 The Accounting Department now plans to develop a cost formula for billing expense so that a contribution-type income statement can be prepared for management's use. Required a. Construct a scatter graph and estimate the cost formula for billing expense. b. Using the least-squares regression method estimate the cost formula for billing expense. Assume that the company plans to sell 30 units during July at a selling price of S100 per unit. Prepare a budgeted income statement for the month, using the contribution format