-60% is the change from 250 to 100
Calculation steps:
[( 100 - 250 ) ÷ 250] x 100 = -60%
Formula
Percentage change = [(100 - 250) / 250] x 100
Subtract the new number by the original number
100 - 250 = -150
-150 ÷ 250 = -0.6
-0.6 x 100 = -60%
Example