Current Drain Calculation

I would like to know how to calculate the following:

12v car battery with 35Ah capacity. 230volt 600w DC to AC power inverter.

How long would a normal 240v 100w room light bulb stay lit?

Thanks

Inverter efficiency for 100 watt load is about 87%.

100w/87% = 115 watts from battery. 115w/ 12.3v = 9.3 amps from battery.

You probably will not get 35 AH out of battery at 9.3 amps. Lets say you get 25 AH at that current. 25AH/9.3A = 2 hours, 41mins.

Thanks you