Math problem: what time do you solve a problem like this?

James Taylor, has credit card debt of $ 1500. His annual Rate is 15%. Geuneunhadorok $ 25 per month minimum payment is determined Their credit card bills were paid. How many years For him to take his credit card to cover that? (Round Nearest whole number) I need formula for this work can give me your hand. Come out an online calculator STEPBY

1 – 25 $ * = 300 $ 2 – 1500 $ 12MONTH * 15% / 100 = 225 3-1500 $ / 5 years = 300 $ 4-1500 $ * 15/100 = 225 gwawa as $ 1,500 per year $ 300 $ savings. 5-1500 $ – 1200 $ – 900 $ – 600 $ – 300 $. ($ 225) (180 $) ($ 135) (90 $) ($ 45) 6-225 $ 180 $ + 135 $ + 90 $ + 45 $ = 675 $ 7-1500 $ 675 $ = 2175 $ 8-2175 $ / 300 $ = 7.25 years