-18.69% is the change from 305 to 248
Calculation steps:
[( 248 - 305 ) ÷ 305] x 100 = -18.69%
Formula
Percentage change = [(248 - 305) / 305] x 100
Subtract the new number by the original number
248 - 305 = -57
-57 ÷ 305 = -0.18688524590163935
-0.18688524590163935 x 100 = -18.69%