please explain step by step :)

15. Your monthly Chargex card invoice just arrived. You have a balance owing of $8,538. The card charges you a rate of 19.99% compounded monthly. The statement indicates a minimum payment of $152.23 per month. Below the minimum payment, there is a section titled "Estimated Time to Pay" which tells you how long it will take to pay off your credit card balance if you only make the minimum monthly payments. What is your estimated time to pay? Assume monthly payments start in one month