107.14% is the change from 420 to 870
Calculation steps:
[( 870 - 420 ) ÷ 420] x 100 = 107.14%
Formula
Percentage change = [(870 - 420) / 420] x 100
Subtract the new number by the original number
870 - 420 = 450
450 ÷ 420 = 1.0714285714285714
1.0714285714285714 x 100 = 107.14%