Please show the formulas and explanations.Thanks

Mary-Jane borrows $650,000 to buy a one bedroom apartment. Her loan calls for equal monthly instalments for over 10 years. Interest on the loan is 5% p.a.

At the end of the fifth year, just after paying the instalment due at that time, May has won May won $6million on Powerball and is considering paying out the loan.

Required: How much is required to repay the loan?