989.61% is the change from 77 to 839
Calculation steps:
[( 839 - 77 ) ÷ 77] x 100 = 989.61%
Formula
Percentage change = [(839 - 77) / 77] x 100
Subtract the new number by the original number
839 - 77 = 762
762 ÷ 77 = 9.896103896103897
9.896103896103897 x 100 = 989.61%