640% is the change from 75 to 555
Calculation steps:
[( 555 - 75 ) ÷ 75] x 100 = 640%
Formula
Percentage change = [(555 - 75) / 75] x 100
Subtract the new number by the original number
555 - 75 = 480
480 ÷ 75 = 6.4
6.4 x 100 = 640%
Example