ANSWER
= $22,390.33
Step-by-step explanation
Amount of each mortgage =loan Balance /annuity factor
Loan balance
=( 100-15)% × $2.79 million.
=2.3715million.
Annuity factor
Monthly interest rate =7.75%/12 =0.65%
Number of months = 15× 12 = 180 months
Annuity factor
= (1- (1.0065)^(-180)/0.0065
=105.9162693
Monthly mortgage payment
=$2.3715 million/ 105.9162693
= $22,390.33