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 10,000 units to 1. 14,000 units. 2. 6,000 units. d. Refer to your answer to part a for total revenues of $50,000. Calculate the firm's operating income (or loss) if unit selling price a variable expense's per unit do not change and total revenues 1. Increase $15,000. 2. Decrease $13,000. Answer is not complete. Complete this question by entering your answers in the tabs below. Refer to your answer to part a for total revenues of $50,000. 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. 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 10,000 units to 1. 14,000 units. 2. 6,000 units. d. Refer to your answer to part a for total revenues of $50,000. Calculate the firm's operating income (or loss) if variable expenses per unit do not change and total revenues 1. Increase $15,000. 2. Decrease $13,000. Answer is not complete. Complete this question by entering your answers in the tabs below. Refer to your answer to part a for total revenues of $50,000. Calculate the firm's operating income (or loss) if unit se price and variable expenses per unit do not change and total revenues decrease by $13,000. \begin{tabular}{|c|c|c|} \hline \multicolumn{3}{|c|}{ Contribution Margin Income Statement } \\ \hline Revenue & & $50,000 \\ \hline Variable expenses: & & \\ \hline Cost of goods sold & \$ 26,000 & \\ \hline Selling expenses & 1,500 & \\ \hline Administrative expenses & 2,500 & \\ \hline & 1 & \\ \hline Total variable expenses & & 30,000 \\ \hline Contribution margin & & 20,000 \\ \hline Fixed expenses: & & \\ \hline Selling expenses & 2,300 & \\ \hline Administrative expenses & 4,700 & \\ \hline+1 & & \\ \hline Total fixed expenses & & 7,000 \\ \hline Operating income & & $.13,000 \\ \hline \end{tabular}