39.84% is the change from 251 to 351
Calculation steps:
[( 351 - 251 ) ÷ 251] x 100 = 39.84%
Formula
Percentage change = [(351 - 251) / 251] x 100
Subtract the new number by the original number
351 - 251 = 100
100 ÷ 251 = 0.398406374501992
0.398406374501992 x 100 = 39.84%