Can anyone help me with this problem?

I don't figure out b and c. If you provide me a brief explanation, that would be great! Thank you.

10.00 points Hoodys for Good manufactures and sells hooded sweatshirts. The company locates its manufacturing facilities in areas with high unemployment rates and provides on-site daycare and education for its employees' children. The company recently started a "one for one" program where they donate one sweatshirt for every one sold to an international charity to provide to a child in need. The customer pays the shipping cost for items purchased, but the company pays to ship to the international charities Cost information is summarized below: Variable Costs Direct Materials $5.00 per unit produced Direct Labor $4.50 per unit produced Variable Manufacturing Overhead $0.50 per unit produced Shipping $5.00 per unit donated Fixed Costs Salaries $40,000 per month Advertising $75,000 per month $60.000 per month Production Equipment Answer each of the following independent questions. 1. Assume that the price of each sweatshirt sold is $45. a. How much contribution margin is earned on each unit sold to a paying customer? Round your final answers to 2 decimal places Answer is complete and correct ntribution Margin 35.00 per unit