506.42% is the change from 109 to 661
Calculation steps:
[( 661 - 109 ) ÷ 109] x 100 = 506.42%
Formula
Percentage change = [(661 - 109) / 109] x 100
Subtract the new number by the original number
661 - 109 = 552
552 ÷ 109 = 5.064220183486238
5.064220183486238 x 100 = 506.42%