505.5% is the change from 109 to 660
Calculation steps:
[( 660 - 109 ) ÷ 109] x 100 = 505.5%
Formula
Percentage change = [(660 - 109) / 109] x 100
Subtract the new number by the original number
660 - 109 = 551
551 ÷ 109 = 5.055045871559633
5.055045871559633 x 100 = 505.5%