Calvin Johnson has a $6,000 debt balance on his Visa card that charges 15.6 percent APR compounded monthly. In 2009, Calvin's minimum monthly payment is 2 percent of his debt balance, which is $120. How many months (round up) will it take Calvin Johnson to pay off his credit card if he pays the current minimum payment of $120 at the end of each month? In 2010, as the result of a federal mandate, the minimum monthly payment on credit cards rose to 3 percent. If Calvin made monthly payments of $180 at the end of each month, how long would it take to pay off his credit card?

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Part 1

a.If Calvin made monthly payments of $120 at the end of each month, how long would it take to pay off his credit card? enter your response here months(Round up to the nearest unit.)