Your friend has $2$ credit cards with balances that she cannot afford to pay off all at once, but she can afford to make more than just the minimum payment. She has a $$450$ balance on a card with $24\mathrm{.}99\%$ APR and a $$600$ balance on the second card with a $18\mathrm{.}99\%$ APR. what advice would you give your friend about paying off the balances on these cards? Which card should be paid off first?