Use the unpaid balance method to find the finance charge on the credit card account for the month of May. The previous month's balance was $950, the annual interest rate is 21%, and the following transactions occurred: Date Transaction May 3 Made a payment of $370 towards account balance. May 12 Charged $106 to card for a rental car. May 21 Charged $95 to card to buy museum tickets. May 29 Returned a camera that cost $69