47.78% is the change from 270 to 399
Calculation steps:
[( 399 - 270 ) ÷ 270] x 100 = 47.78%
Formula
Percentage change = [(399 - 270) / 270] x 100
Subtract the new number by the original number
399 - 270 = 129
129 ÷ 270 = 0.4777777777777778
0.4777777777777778 x 100 = 47.78%