-74.4% is the change from 250 to 64
Calculation steps:
[( 64 - 250 ) ÷ 250] x 100 = -74.4%
Formula
Percentage change = [(64 - 250) / 250] x 100
Subtract the new number by the original number
64 - 250 = -186
-186 ÷ 250 = -0.744
-0.744 x 100 = -74.4%
Example