Shown here is an income statement in the traditional format for a firm with a sales volume of 7.800 unis. Cost formulas also are thowr: Required: a. Prepare an income statement in the contribution margin format b. Calculate the contribution margin per unit and the contribution margin ratio c. Calculate the firmis operating income (or loss) if the volume changed from 7.800 units to 1. 11700 units 2. 3900 uniti. d. Refer to your answer to part of for total revenues of 534,300 . Calculate the firm's operating income (or toss) if unit selling price and variable expenses per unit do not change and total revenues 1. increase by $10,500 2. Decrease by 52500 Complete this question tyy entering your answers in the tabs below