At a music festival, T-shirts are sold for $15 and sweatshirts are sold for $20. The festival organizers pay x dollars for each T-shirt and y dollars for each sweatshirt. The festival sells 53 T-shirts and 39 sweatshirts.
a. Write and simplify an expression that represents the profit.
b. A T-shirt costs the festival organizers $8, and a sweatshirt costs $14. What is the profit?