Jesus.....feels like I'm sitting the leaving cert again ; )

If increasing wheel size by an inch, I would imagine the height is only increased by .5 inch (not inc tyre) as its a circle. While dropping the car an inch will "drop the car" exactly an inch, so front bumper should be .5inch closer to the ground.

Tyres are a variable, depending on what profile/width tyre was on it before.

The car will look lower due to the body now being closer to the wheel (which are now bigger so will look better in arches)

That's how it's working out in my head