Mary owes an amount of $1,220 on her credit card. The annual percentage rate (APR) is 18.00%, compounded monthly. Her minimum monthly payment is $20.
a. If she makes only this minimum payment, how long will it take to repay the card balance (assuming no more charges are made)?
b. If she makes the minimum payment plus $10 extra each month (for a total of $30), how long will it take to repay the card balance?
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