On December 1.2020 , Sheridan Corporation incurs a 15 -year $400000 mortgage liability in conjunction with the acquigtion of an office building. This mortgage is payable in monthly installments of $4800, which include interest computed 3+ therite of 125 pet year. The first monthly nayment is made on December 31, 2020. The portion of the second monthly payment made on January 31 . 2021, which represents repayment of principatis: $800. $4800. $3992. $808