Please do it as early as possible

Mary is going to take out an unsubsidized student loan of $20,500 at a 4.8% APR, compounded monthly, to pay for her last 2 semesters of college. She will begin paying off the loan in 9 months with monthly payments lasting for 12 years, and she's wondering what her monthly payment will be. She's also wondering what her monthly payment would have been if her student loan had been subsidized instead of unsubsidized. Help Natasha figure it out. What will be Marys' monthly payment? What would Mary's monthly payment have been if her student loan was subsidized instead of unsubsidized