Use of Credit Card A business-school student used a BankAmericard for a variety of purchases. When checking his monthly bill, he compared his original copy with a duplicate copy for a gasoline purchase made at a local discount-store shopping center. The original copy showed a purchase of $4.25;

the duplicate was raised to $6.25.

Who obtained the extra $2.00? How can the system be improved to prevent such thievery? lo1