Tricky Maths

*VERY TRICKY MATHS.
Note: This riddle must be
done IN
YOUR HEAD ONLY and NOT
using
paper and a pen.
Try it.
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?
Let's go there...