50% is the change from 144 to 216
Calculation steps:
[( 216 - 144 ) ÷ 144] x 100 = 50%
Formula
Percentage change = [(216 - 144) / 144] x 100
Subtract the new number by the original number
216 - 144 = 72
72 ÷ 144 = 0.5
0.5 x 100 = 50%
Example