First it’s easy to do calculation but it’s hard for u to really estimate...
Y?

Coz the real schedule not really the one given by developer. So timing of developer claiming each stage is more critical for this calculation

Also depending of which floor you buying... lower floor faster claim by developer. Higher floor is slower claim. So actually if the floor price different not too much, perhaps go for higher floor more worth it.

Another factor also based on the BR. Each change will change a lot in ur calculation...

You only can estimate a rough figure but what’s the point?

If own stay, perhaps park more money in the account will do to reduce interest
For investment, just make sure ur rental can cover them it will be good, best can cover more to reduce interest.