The tricky part is keeping track of profits across the transactions!

So, what’s the final answer?

The correct solution to this cow puzzle is $400. Let’s break it down step by step:

1. You purchase the cow for $800.
2. You sell it for $1,000.
   • Profit so far: +$200.
3. You buy the cow again for $1,100.
   • Net balance: -$900.
4. You sell the cow for $1,300.

Final profit = $400.