8. Calculating credit card interest. Ruby Wilson, a student at State College, has a balance of
$380 on her retail charge card; if the store levies a finance charge of 21 percent per year,
how much monthly interest will be added to Ruby’s account?
9. Balance transfer credit cards. Zoe Robinson has several credit cards, on which she is
carrying a total current balance of $14,500. She is considering transferring this balance to a
new card issued by a local bank. The bank advertises that, for a 2 percent fee, she can
transfer her balance to a card that charges a 0 percent interest rate on transferred balances
for the first nine months. Calculate the fee that Zoe would pay to transfer the balance, and
describe the benefits and drawbacks of balance transfer cards.
Zoe has a fairly large balance of $14,500 on her credit cards. If her current cards charge her 12%
10. Credit card liability. Luna was reviewing her credit card statement and noticed several
charges that didn’t look familiar to her. Lina is unsure whether she should “make some
noise,” or simply pay the bill in full and forget about the unfamiliar charges. If some of
these charges aren’t hers, is she still liable for the full amount? Is she liable for any part of
these charges—even if they’re fraudulent?