What do you think of this perplexed Maths?

You have 5,000 money units, and you decide to invest them in 5 different projects, 1,000 units each.

One year later you have this result:

1. In 2 of your projects you made a profit of 100%.
2. In other 2 of your projects you neither won nor lost money.
3. In 1 project you lost 1,000 plus those 1,000 that you had invested.

On the first sight, you’d think that now you should have the money that you’d started with. But let’s make the Math now.

2 x +2,000 = +4,000
2 x +1,000 = +2,000
1 x -2,000 = -2,000

So, when you abstract -2,000 from your +6,000, you’ll get +4,000.

Wait a minute, what???

You win twice and lose only once and as a total you’re in minus???