(Please use an finance equation and/ or formula rather than using a sheet chart, excel, or graph)

You recently purchased a new Apple iphone for $999 paid for with a credit card that charges 20% interest rate. The minimum payment on the card is $25 per month. If you make the minimum monthly payment and have no other charges, how many additional months are required to pay off the charges?

45.23

35.88

47.55

38.44

41.84