50% is the change from 180 to 270
Calculation steps:
[( 270 - 180 ) ÷ 180] x 100 = 50%
Formula
Percentage change = [(270 - 180) / 180] x 100
Subtract the new number by the original number
270 - 180 = 90
90 ÷ 180 = 0.5
0.5 x 100 = 50%
Example