974.07% is the change from 81 to 870
Calculation steps:
[( 870 - 81 ) ÷ 81] x 100 = 974.07%
Formula
Percentage change = [(870 - 81) / 81] x 100
Subtract the new number by the original number
870 - 81 = 789
789 ÷ 81 = 9.74074074074074
9.74074074074074 x 100 = 974.07%