Shown here is an income statement in the traditional format for a firm with a sales volume of 7,800 units. Cost formulas also are shown 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 firm's operating income (or loss) if the volume changed from 7,800 units to 1. 11,700 units. 2. 3,900 units. d. Refer to your answer to part a for total revenues of $34,100. Calculate the firm's operating income (or loss) if unit selling price and variable expenses per unit do not change and total revenues 1. Increase by $15,000. 2. Decrease by $3,000. \begin{tabular}{|l|l|l|} \hline \multicolumn{2}{|c|}{ Contribution Margin Income Statement } \\ \hline & & \\ \hline Variable expenses: & & \\ \hline & & \\ \hline & & \\ \hline & & \\ \hline Total variable expenses & & \\ \hline & & \\ \hline Fixed expenses: & & \\ \hline & & \\ \hline \hline & & \\ \hline & & \\ \hline \hline & & \\ \hline Total fixed expenses & & \\ \hline & & \\ \hline \end{tabular} Calculate the contribution margin per unit and the contribution margin ratio. Note: Do not round intermediate calculations. Round "contribution margin per unit" to 2 decimal places. Calculate the firm's operating income (or loss) if the volume changed from 7,800 units to 11,700 units. Note: Do not round intermediate calculations. Calculate the firm's operating income (or loss) if the volume changed from 7,800 units to 3,900 units. Refer to your answer to part a for total revenues of $34,100. Note: Do not round intermediate calculations. Refer to your answer to part a for total revenues of $34,100. Calculate the firm's operating income (or loss) if unit selling price and variable expenses per unit do not change and total revenues increase by $15,000. Note: Round intermediate calculations to 2 decimal places. Refer to your answer to part a for total revenues of $34,100. Calculate the firm's operating income (or loss) if unit selling price and variable expenses per unit do not change and total revenues decrease by $3,000. Note: Round intermediate calculations to 2 decimal places