36% is the change from 225 to 306
Calculation steps:
[( 306 - 225 ) ÷ 225] x 100 = 36%
Formula
Percentage change = [(306 - 225) / 225] x 100
Subtract the new number by the original number
306 - 225 = 81
81 ÷ 225 = 0.36
0.36 x 100 = 36%
Example