Calvin Johnson has a $6,000 debt balance on his Visa card that charges 15.9 percent APR compounded monthly. In2009, Calvin's minimum monthly payment is 3 percent of his debtbalance, which is $180. How many months(round up) will it take Calvin Johnson to pay off his credit card if he pays the current minimum payment of $180 at the end of eachmonth? In2010, as the result of a federalmandate, the minimum monthly payment on credit cards rose to 4 percent. If Calvin made monthly payments of $240 at the end of eachmonth, how long would it take to pay off his creditcard?

Part 1

a.If Calvin made monthly payments of $180 at the end of eachmonth, how long would it take to pay off his creditcard?

enter your response here months(Round up to the nearestunit.)

Part 2

b.If Calvin made monthly payments of $240 at the end of eachmonth, how long would it take to pay off his creditcard?

enter your response here months(Round up to the nearestunit.)