Answer:
Monthly paymenty for $ 997.954 
Step-by-step explanation:
 We have to calcualte for the PTM of the mortgage for the first three years at which the rate is fixed:
 
 
PV $150,000
time 360 (30 years x 12 months)
rate 0.005833333 (7% annual / 12 months)
 
 
C $ 997.954