Quantitative reasoning 

Please help:(

Suppose that on January 1 you have a balance of ?$4000 on a credit card whose APR is 19?%, which you want to pay off in 2 years. Assume that you make no additional charges to the card after January 1.

A: what is your monthly payment?

B: When the card is paid? off, how much will you have paid since January? 1?

C: What percentage of your total payment? (part b) is? interest?