Please help! And please explain how to get answers so I can learn how to do it on future problems. Thanks in advance! I'll be sure to give a thumbs up.

2-a. Refer to the original data. Management is considering using higher-quality components that would increase the variable expense by $4 per unit. The marketing manager believes that the higher-quality product would increase sales by 20% per month. Calculate the change in total contribution margin. Total contribution margin by 2-b. Should the higher-quality components be used? Yes No 2-a. Refer to the original data. Management is considering using higher-quality components that would increase the variable expense by $4 per unit. The marketing manager believes that the higher-quality product would increase sales by 20% per month. Calculate the change in total contribution margin. Total contribution margin by 2-b. Should the higher-quality components be used? Yes No