Example 2 Alex has a charge account at Diamond Jewelers, which uses the unpaid-balance method of computing finance charges. The periodic rate is 1.85%. If their previous balance is $478.68, they had...

Extracted text: Example 2 Alex has a charge account at Diamond Jewelers, which uses the unpaid-balance method of computing finance charges. The periodic rate is 1.85%. If their previous balance is $478.68, they had payments/credits of $250.00, and new purchases of $38.50 what is their (a) unpaid balance, (b) finance charge, and (c) new balance? Example 3 Roger's charge account uses the unpaid balance method to compute the finance charge at a monthly periodic rate of 2.3%. During the month he charged $128.47, made a $150 payment and had a $7.45 finance charge. What is his (a) unpaid balance, (b) previous balance, and (c) new balance?