487.16% is the change from 109 to 640
Calculation steps:
[( 640 - 109 ) ÷ 109] x 100 = 487.16%
Formula
Percentage change = [(640 - 109) / 109] x 100
Subtract the new number by the original number
640 - 109 = 531
531 ÷ 109 = 4.871559633027523
4.871559633027523 x 100 = 487.16%