value: 2.50 points 2-a. Refer to the original data. Management is considering using higher-quality components that would increase the variable expense by $2 per unit. The marketing manager believes that the higher-quality product would increase sales by 10% per month. Calculate the change in total contribution margin. ntribution margin increases 2-b. Should the higher-quality components be used? value: 2.50 points 2-a. Refer to the original data. Management is considering using higher-quality components that would increase the variable expense by $2 per unit. The marketing manager believes that the higher-quality product would increase sales by 10% per month. Calculate the change in total contribution margin. ntribution margin increases 2-b. Should the higher-quality components be used