Maria Hernandez was reviewing her recent bank credit card account statement when she found two charges that she and Victor could not have made. The charges were for rental of a hotel room and purchase of a meal on the same day in a distant city. These charges totaled $219.49 out of the couple's $367.89 balance for the month.
(a) What payment should Maria make on the account?
(b) How should she notify her credit card issuer about the unauthorized use?
(c) Once the matter is resolved, what should Maria do to ensure that her credit history is not negatively affected by this error?