800% is the change from 71 to 639
Calculation steps:
[( 639 - 71 ) ÷ 71] x 100 = 800%
Formula
Percentage change = [(639 - 71) / 71] x 100
Subtract the new number by the original number
639 - 71 = 568
568 ÷ 71 = 8
8 x 100 = 800%
Example