Suppose that on January $1$ you have a balance of $$$$2500$ on a credit card whose APR is $12\%,$ which you want to pay off in $1$ year. Assume that you make no additional charges to the card after January $1.$

a$.$ Calculate your monthly payments.

b$.$ When the card is paid$$ off, how much will you have paid since January$1?$

c$.$ What percentage of your total payment from part$($b$)$ is$$ interest?