A cow, transactions and numbers that intertwine… This mathematical puzzle has challenged thousands of Internet users. However, the solution is simple if we follow the steps with method. So, will you be able to find the total profit?
Conduct of the problem

You do a series of transactions on a cow:

Purchase of the cow for 800 euros.
Sale of the cow for EUR 1 000. (Benefit: 200 euros)
Purchase of the cow for 1,100 euros. (Expenditure: – – – – – – – – – – – – – – – – – – – –
Resale of the cow for EUR 1 300. (Benefit: 200 . . . . . . . . . .
The question is simple: what is the total benefit?

Let’s analyse transaction by transaction
First transaction
Purchase of EUR 800, sale at EUR 1 000
Benchage achieved: 1 000 – 800 EUR 200

Second transaction
Purchase of EUR 1 100, for sale at EUR 1 300
Achieved: 1,300 – 1,100 EUR 200

Total profit after the two transactions: 200 – 200 – 400 –
Trap to avoid
The puzzle may seem misleading, as one might think that the second transaction cancels the original profit. But in reality, every purchase-revent is an independent transaction, and only the winnings on each sale are taken into account.

Answer:

The correct answer is a total benefit of 400 euros.

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