11. The previous monthly balance on Barney Laurent's charge card is $144. 79. He made a payment of $144. 79 and had charges of $125. 22,

$23. 22, and $33. 65. There is no finance charge.

12. Amber Cho's monthly statement for her credit card shows a $529. 78

previous balance, her $85. 00 payment, a $7. 95 finance charge, and

credits of $49. 45 and $39. 22. This month's new purchases are $277. 32

and $38. 20.

13. Mario Azaria received the charge account statement partially shown

below. Find his (a) payments and credits, (b) new purchases, and

(c) new balance.