809.86% is the change from 71 to 646
Calculation steps:
[( 646 - 71 ) ÷ 71] x 100 = 809.86%
Formula
Percentage change = [(646 - 71) / 71] x 100
Subtract the new number by the original number
646 - 71 = 575
575 ÷ 71 = 8.098591549295774
8.098591549295774 x 100 = 809.86%