13.15% is the change from 251 to 284
Calculation steps:
[( 284 - 251 ) ÷ 251] x 100 = 13.15%
Formula
Percentage change = [(284 - 251) / 251] x 100
Subtract the new number by the original number
284 - 251 = 33
33 ÷ 251 = 0.13147410358565736
0.13147410358565736 x 100 = 13.15%