500% is the change from 128 to 768
Calculation steps:
[( 768 - 128 ) ÷ 128] x 100 = 500%
Formula
Percentage change = [(768 - 128) / 128] x 100
Subtract the new number by the original number
768 - 128 = 640
640 ÷ 128 = 5
5 x 100 = 500%
Example