10% is the change from 30 to 33
Calculation steps:
[( 33 - 30 ) ÷ 30] x 100 = 10%
Formula
Percentage change = [(33 - 30) / 30] x 100
Subtract the new number by the original number
33 - 30 = 3
3 ÷ 30 = 0.1
0.1 x 100 = 10%
Example