70% is the change from 180 to 306
Calculation steps:
[( 306 - 180 ) ÷ 180] x 100 = 70%
Formula
Percentage change = [(306 - 180) / 180] x 100
Subtract the new number by the original number
306 - 180 = 126
126 ÷ 180 = 0.7
0.7 x 100 = 70%
Example