I asked this in a previous question on here and what I was given was as a response from whoever answered my question ks completely wrong when i checked my answer. I already solved for A and needed help solving for B, C, and D. I would like to see how each was sloved to help in my understanding of the problem

Shown here is an income statement in the traditional format for a firm with a sales volume of 7,700 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 7,700 units to 1. 11,550 units 2. 3,850 units. d. Refer to your answer to part a for total revenues of $35,000. 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 $11,000 2. Decrease by $2,500