3.57% is the change from 420 to 435
Calculation steps:
[( 435 - 420 ) ÷ 420] x 100 = 3.57%
Formula
Percentage change = [(435 - 420) / 420] x 100
Subtract the new number by the original number
435 - 420 = 15
15 ÷ 420 = 0.03571428571428571
0.03571428571428571 x 100 = 3.57%