Getting a percent of a number

25% of 500 is what.
.25 x 500 = X
125= X

or 25/100 x 500/1 =
1/4 x 500/1=
125/1
125

What percent of 75 is 15?
X x 75 = 15
75X = 15

(75X)/75 = 15/75
X = . ?

then change it to a percent

or

X/100 = 15/75

There you are Carla