30% is the change from 270 to 351
Calculation steps:
[( 351 - 270 ) ÷ 270] x 100 = 30%
Formula
Percentage change = [(351 - 270) / 270] x 100
Subtract the new number by the original number
351 - 270 = 81
81 ÷ 270 = 0.3
0.3 x 100 = 30%
Example