No BS and show all of your work please and you must use the 1% or 10% method which I don’t know what that is LOL

Answers:
38% of 15 = 5.7
29% of 75 = 21.75
4% of 220 = 8.8
No idea what the 1% or 10% method is either. But these answers would be better then to leave the questions blank.