1878.57% is the change from 42 to 831
Calculation steps:
[( 831 - 42 ) ÷ 42] x 100 = 1878.57%
Formula
Percentage change = [(831 - 42) / 42] x 100
Subtract the new number by the original number
831 - 42 = 789
789 ÷ 42 = 18.785714285714285
18.785714285714285 x 100 = 1878.57%