$4 is what percent of $50

It is 8 percent of 50. 

This is 1 way-
4/50=%/100 You now have a proportion. Cross multiply.
50%=400 Replace % with any variable.
50x=400 Now divide both sides of the equation by 50.
x=8

(% is basically the percentage of 4 of 50 over 100. its much easier to solve percentage problems when the percentages are over 100. 100 represents a full percentage. 
example- 4 of 100 is 4% of 100)

2nd example-
Since the percentage can be found if over 100 as well (%/100), and since 100 is a multiple of 50, we can do 4 of 50 (which would look like 4/50) and multiply  both numbers by 2 to get the percentage. These are our steps:

4/50× 2/2=
8/100

Therefore, 4 of 50 is 8% of 50

M< 5 = 80 , < 2 = 80, < 6= 100, < 3= 100, < 7= 80, < 4= 80, < 8= 100