121.43% is the change from 140 to 310
Calculation steps:
[( 310 - 140 ) ÷ 140] x 100 = 121.43%
Formula
Percentage change = [(310 - 140) / 140] x 100
Subtract the new number by the original number
310 - 140 = 170
170 ÷ 140 = 1.2142857142857142
1.2142857142857142 x 100 = 121.43%