Time racing with calculations

I know the majority falls in error knowing that it is a normal account, but we are all racing for success, so I ask you to participate as well as not to race with time - a very difficult calculation! Note: You only have accounts in your head,

Do not use paper, pen or calculator. Try this:

1000 Add to 40. Add another 1000 now. Add Now

Add 1000 more. Add now 20. Add another 1000 now

Add 10. What is the total?

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