Tricky Algebra Sum Riddle

Tricky Algebra Sum Riddle Solution - 23 November

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

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Solution
4100
some people might guess 5000