The answer I think should be 0.2, and I just used my calculator so I dont really know how to explain how to do it. I dont know FOR SURE if that answer is right tho.
All you have to do is find out what 10% of 40 is then add it back to 40. In the case of finding 10% of something you just “chop” of the back number (or move the decimal place forward) so 10% of 40 is 4. The. 40+4=44.
You can also multiply fractions to find the percent of a number but that is not necessary in this case.
