Now we only add the winnings from completed cycles:
€200 + €200 = €400 .
A classic mistake is to think that a purchase of 1,100 euros “eats up” the first 200 euros, but that’s not true. It simply opens a new transaction, separate from the first. Imagine two independent train tickets: the cost of one does not affect the income of the other.
To avoid confusion in such data, it is convenient to draw two columns: “Expenses” and “Income”, and then group actions into pairs of logically related transactions. Here, the first pair is a purchase for 800 euros and a sale for 1,000 euros, the second is a purchase for 1,100 euros and a sale for 1,300 euros. Summing up the profits gives the sum.
Result: your profit is 400 euros.
This method always works: just break down the story into small, complete scenes, and everything becomes obvious.
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