solve for both scenerios a 15000 and b 2000

(Annuity number of periods) Alex Karev has taken out a $180,000 loan with an annual rate of 9 percent compounded monthly to pay off hospital bllss from his wife Lzzy's inness. If the most Alex can afford to paty is $1.500 per month, how long wil i take to pay of the loan? How long will it take for Bim to pay off the loan if he can pay $2.000 per month? Use five decimal places for the menthly peroentage rate in your calculations