-96.4% is the change from 250 to 9
Calculation steps:
[( 9 - 250 ) ÷ 250] x 100 = -96.4%
Formula
Percentage change = [(9 - 250) / 250] x 100
Subtract the new number by the original number
9 - 250 = -241
-241 ÷ 250 = -0.964
-0.964 x 100 = -96.4%
Example