http://mining.thegenesisblock.com/a/6dd76c6ce6Mine looks good. The biggest problem with your calculation is you used BTC for price of hardware. 90 BTC.
Just want to know where you got 90 from? Because in-order to have paid 90 BTC, the exchange price would've had to been at $70. It hasn't been at $70 for quite some time now so... dumb or just starting shit?
