-13.75% is the change from 291 to 251
Calculation steps:
[( 251 - 291 ) ÷ 291] x 100 = -13.75%
Formula
Percentage change = [(251 - 291) / 291] x 100
Subtract the new number by the original number
251 - 291 = -40
-40 ÷ 291 = -0.13745704467353953
-0.13745704467353953 x 100 = -13.75%