Quick math question

[Sir Pawnalot]

As you may have noticed my approach to poker is more conceptual than mathematical. I use common poker terms and twist their meaning so that they make sense to me. This confuses everybody but me.

I have always said that we all need to become experts in the mathematics of poker and therefore I have started studying this aspect of poker.

I thought I had a good grasp of the basic calculations, but something I read on Spoonitnow´s internet site made me believe that either I am wrong or Spoon just made a mistake:

Pot is 10 USD, Villain goes all-in for 12 USD.

"If you have 20% equity, then that means you will win 20% of the time and lose 80% of the time. When you win, you win the $10 originally in the pot plus the $12 your opponent is putting in with his bet for a total of $22. When you lose, you lose the $12 you are putting in for the call. To figure out your EV, take 20% of $22 (your win % times the amount you win) and subtract 80% of $12 (your lose % times the amount you lose). Here we get 0.20 * $22 = $4.40 and 0.80 * $10 = $8.00, and $4.40 - $8.00 = -$3.60. So the equity of calling when you have 20% equity is -$3.60, or a loss of $3.60."

This is how I make those calculations:

Win: 20*22 USD= 440 USD
Lose: 80*12 USD= 960 USD
Profit per decision440-960)/100=-5.2 USD

I can not understand how this can be wrong and I hope Spoon just screwed it up on this example.

[Parasurama]

Spoon made a mistake, he said he was going to multiply .8*12 but instead multiplied .8*10.

[Sir Pawnalot]

TY