Use the unpaid balance method to find the finance charge on the credit card account. Last month's balance, the payment, the annual interest rate, and any other transactions are given below. Last month's balance, $640 Payment, $330 Interest rate, 16.8% Bought dog, $100 Bought pet supplies, $45 Paid veterinarian bill, $85 The finance charge is $1. (Round to the nearest cent as needed.)