I have no idea how to do this either. plz help. thank you.

A couple finances a house valued at $150,000. The monthly principal and interest payment has been determined to be $599.32. Taxes on the property are estimated to be $621 per year. Insurance on the property is projected to cost $685 per year.
The monthly PITI payment is

I would just divide each of the taxes and insurance by 12 and add it to the monthly mortgage payment