839.02% is the change from 82 to 770
Calculation steps:
[( 770 - 82 ) ÷ 82] x 100 = 839.02%
Formula
Percentage change = [(770 - 82) / 82] x 100
Subtract the new number by the original number
770 - 82 = 688
688 ÷ 82 = 8.390243902439025
8.390243902439025 x 100 = 839.02%