What's 20% Of 40?

They want to know what is 20 % of 40.

It's actually very comfortable to find out 20% of anything.

Just start with 10% by moving the decimal one place to the left.
(so you start with 40.  10% is 4.0)

20% would be twice that (so 4.0 + 4.0 = 8.0)
you take 40 and multiply by 20%
20% of 40 is 8.

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