8.4% is the change from 250 to 271
Calculation steps:
[( 271 - 250 ) ÷ 250] x 100 = 8.4%
Formula
Percentage change = [(271 - 250) / 250] x 100
Subtract the new number by the original number
271 - 250 = 21
21 ÷ 250 = 0.084
0.084 x 100 = 8.4%
Example