formula for solving percentage difference?

Question

I know its x___y times 100
y

I need help. example..... what is the percentage change of 148 and 152. thanks

Answer 1

Difference
----------------- x 100
First number

For example from 148 to 152 is a difference of 4:

4
----- x 100 = 2.7027% increase
148

Answer 2

The formula for the change from 152 to 148 is (letting 148 = y and 152 = x):

[(x - y)/x][100%] =

Using the numbers given:

[(152 - 148)/152][100%] = (4/152)(100%) = 2.63


Reverse the numbers if the change is going from 148 to 152.