27.78% is the change from 270 to 345
Calculation steps:
[( 345 - 270 ) ÷ 270] x 100 = 27.78%
Formula
Percentage change = [(345 - 270) / 270] x 100
Subtract the new number by the original number
345 - 270 = 75
75 ÷ 270 = 0.2777777777777778
0.2777777777777778 x 100 = 27.78%