15.56% is the change from 270 to 312
Calculation steps:
[( 312 - 270 ) ÷ 270] x 100 = 15.56%
Formula
Percentage change = [(312 - 270) / 270] x 100
Subtract the new number by the original number
312 - 270 = 42
42 ÷ 270 = 0.15555555555555556
0.15555555555555556 x 100 = 15.56%
Example