1000 and add 40 to it Puzzle

Note: This riddle must be done IN YOUR HEAD ONLY and NOT using paper and a pen.

Take 1000 and add 40 to it.

Now add another 1000.

Now add 30.

Another 1000.

Now add 20.

Now add another 1000.

Now add 10.

What is the total?

Answer

Did you get 5000?
The correct answer is actually 4100.
Don't believe it? Check with your calculator!

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