How to solve percentaage problems

1. 50 of 16 %

16/1 into 50/100

800/100

as 8 is the answer

2. 60 of 10 %

10/1 into 60 / 100

600 / 100

as 6 is the answer

3. 55 % of 22

22/1 into 55/100

1210 / 100

12.1