The couple borrowed $$600,000$ from bank ABC two years ago to buy an apartment as an investment property near their restaurant. They have been paying monthly mortgage payments $($principal and interest, equal amount at the end of each month$)$ with an annual fixed interest rate of $4\mathrm{.}8\%$ for two years and the mortgage contract has eight years remaining. What is the payment per mounth and the remaining balance of the loan after $2$ years?