If we short call option intraday earn profit and square off how much we earn?

It depends upon at how much price you short the option and at what price you buy it back , and deduct 40 rs brokerage and 10-20 other rupee’s here and there of other charges

As per Zerodha brokerage calculator, Break even is about 0.33 points… which means if you sell at 100 and buy back at 90… you profit will roughly “n” x 9.6 [n= number for units you have trade ]

can u pls explain this in detail ?