1029.87% is the change from 77 to 870
Calculation steps:
[( 870 - 77 ) ÷ 77] x 100 = 1029.87%
Formula
Percentage change = [(870 - 77) / 77] x 100
Subtract the new number by the original number
870 - 77 = 793
793 ÷ 77 = 10.2987012987013
10.2987012987013 x 100 = 1029.87%