Need help with part b as well.

(Annuity number of periods) Alex Karev has taken out a $200,000 loan with an annual rate of 9 percent compounded monthly to pay off hospital bills from his wife Izzy's illness. If the most Alex can afford to pay is $3,500 per month, how long will it take to pay off the loan? How long will it take for him to pay off the loan if he can pay $4,000 per month? Use five decimal places for the monthly percentage rate in your calculations. a. If Alex can pay $3,500 per month, the number of years it takes for him to pay off the loan is years. (Round to one decimal place.)