388.55% is the change from 131 to 640
Calculation steps:
[( 640 - 131 ) ÷ 131] x 100 = 388.55%
Formula
Percentage change = [(640 - 131) / 131] x 100
Subtract the new number by the original number
640 - 131 = 509
509 ÷ 131 = 3.885496183206107
3.885496183206107 x 100 = 388.55%