Problem:
You have been pricing a compact disk player in several stores. 3 stores have the identical price of $300. Each storecharges 18% APR, has a 30 day grace period, and sends out bills on the 1st of the month. On further investigation, you find that store A calculates the finance charge by using the average daily balance method, store B uses the adjusted balance method, and store C uses the previous balance method. Assume you purchased the disk player on May 5 and made a $100 payment on June 15. What will the finance charge be if you made your purchase from store A? From store B? From store C?