7.97% is the change from 251 to 271
Calculation steps:
[( 271 - 251 ) ÷ 251] x 100 = 7.97%
Formula
Percentage change = [(271 - 251) / 251] x 100
Subtract the new number by the original number
271 - 251 = 20
20 ÷ 251 = 0.0796812749003984
0.0796812749003984 x 100 = 7.97%