20.71% is the change from 420 to 507
Calculation steps:
[( 507 - 420 ) ÷ 420] x 100 = 20.71%
Formula
Percentage change = [(507 - 420) / 420] x 100
Subtract the new number by the original number
507 - 420 = 87
87 ÷ 420 = 0.20714285714285716
0.20714285714285716 x 100 = 20.71%