-18.36% is the change from 305 to 249
Calculation steps:
[( 249 - 305 ) ÷ 305] x 100 = -18.36%
Formula
Percentage change = [(249 - 305) / 305] x 100
Subtract the new number by the original number
249 - 305 = -56
-56 ÷ 305 = -0.18360655737704917
-0.18360655737704917 x 100 = -18.36%