20% is the change from 35 to 42
Calculation steps:
[( 42 - 35 ) ÷ 35] x 100 = 20%
Formula
Percentage change = [(42 - 35) / 35] x 100
Subtract the new number by the original number
42 - 35 = 7
7 ÷ 35 = 0.2
0.2 x 100 = 20%
Example