-93.2% is the change from 250 to 17
Calculation steps:
[( 17 - 250 ) ÷ 250] x 100 = -93.2%
Formula
Percentage change = [(17 - 250) / 250] x 100
Subtract the new number by the original number
17 - 250 = -233
-233 ÷ 250 = -0.932
-0.932 x 100 = -93.2%
Example