55.78% is the change from 251 to 391
Calculation steps:
[( 391 - 251 ) ÷ 251] x 100 = 55.78%
Formula
Percentage change = [(391 - 251) / 251] x 100
Subtract the new number by the original number
391 - 251 = 140
140 ÷ 251 = 0.5577689243027888
0.5577689243027888 x 100 = 55.78%