109.3% is the change from 129 to 270
Calculation steps:
[( 270 - 129 ) ÷ 129] x 100 = 109.3%
Formula
Percentage change = [(270 - 129) / 129] x 100
Subtract the new number by the original number
270 - 129 = 141
141 ÷ 129 = 1.0930232558139534
1.0930232558139534 x 100 = 109.3%