20.24% is the change from 420 to 505
Calculation steps:
[( 505 - 420 ) ÷ 420] x 100 = 20.24%
Formula
Percentage change = [(505 - 420) / 420] x 100
Subtract the new number by the original number
505 - 420 = 85
85 ÷ 420 = 0.20238095238095238
0.20238095238095238 x 100 = 20.24%