if you might know what part C and D are please answer as well thank you!

Personal Electronix sells computer tablets and MP3 players. The business is divided into two divisions along product lines. CVP income statements for a recent quarter's activity are presented below. (a) Determine sales mix percentage and contribution margin ratio for each division. Calculate the company's weighted-average contribution margin ratio. (Round computations and final answer to 2 decimal places, es. 15.26\%) Weighted-average contribution margin ratio