OHaganBooks.com has recently decided to start selling music albums online through a service it calls o'Tunes. Users pay a fee to download an entire music album. Composer royalties and copyright fees cost an average of $5.50 per album, and the cost of operating and maintaining o'Tunes amounts to $500 per week. The company is currently charging customers $9.50 per album. a) What are the associated (weekly) cost, revenue, and profit functions? (9 points) b) How many albums must be sold per week to make a profit? (3 points) c) If the charge is lowered to $8.00 per album, how many albums must be sold per week to make a profit? (3 points)