15.71% is the change from 420 to 486
Calculation steps:
[( 486 - 420 ) ÷ 420] x 100 = 15.71%
Formula
Percentage change = [(486 - 420) / 420] x 100
Subtract the new number by the original number
486 - 420 = 66
66 ÷ 420 = 0.15714285714285714
0.15714285714285714 x 100 = 15.71%