Please show your work, draw a cash flow diagram, and do not use Excel. Thank you. You are appreciated.

Kentrel Steptoe's credit card balance statement for October interest charges is $2,500. At an interest rate of 20% per year, (a) what is the minimum payment that Mr. Steptoe has to make at the end of the month of October to carry that $2,500 balance into the next month? (b) What should be his minimum payment the next month to carry the same $2,500 into December? (10\%)