Could you please show your work without using a caculator. Thank You.

You owe $10,000 on a credit card with an interest rate of 15%, which is compounded monthly. If you make payments of $1,000 per month, how many months will it take you to pay off your debt? (Enter the answer to 2 decimal places) You just borrowed $50,000 to buy a car. You will pay back this loan with monthly payments of $1,610 for 4 years. What is the APR (annual percentage rate) on this loan? (Enter the answer in percentage format to two decimal places without the % sign -> 9.32 and not 9.32% or 0932")