If you have to ask . . .
Including insurance, maintenance (average year), hangarage, landing fees and fuel my 150 cost me around £150 per hour over the last 12 months. That covers 60 hours flying. Per hour would drop if I flew more.
Plane itself has a capital cost of £11,000 which if I sold tomorrow I would expect to get back.
The big hidden cost is maintenance which you never know about. Take engines as an example, a couple of years ago mine was only 1200 hours since zero timed but the alternator drive shaft broke, metal in the oil, engine rebuild and £Lots worse off.
I'm sure I could cut costs (e.g. storing outside not hangaring would save £1,800 or £30 per flying hour), but ...