Start with $800 ( that’s not consider profit so it can’t be included in the final “ profit earning “

Buy a cow for $800 ….

You at 0

Sell it for for $1900

So you got your original $800 back plus a profit of $1100

Buy “ it agian FOR aka new price “ $1100

So you have original $800 not profit plus 0 profit since you bought a new cow for $1100

And then you sell it for $700 which then leaves you with $400 profit

So the final is $800 original plus $400 profit

If you say what’s your total income then it’s $1200

But if you ask what was the profit income then it’s $400

This happens all the time when checking your winning bets on draftkings

You bet $1000 and get back $1980

Your profit is $980 not $1980