-96% is the change from 1000 to 40
Calculation steps:
[( 40 - 1000 ) ÷ 1000] x 100 = -96%
Formula
Percentage change = [(40 - 1000) / 1000] x 100
Subtract the new number by the original number
40 - 1000 = -960
-960 ÷ 1000 = -0.96
-0.96 x 100 = -96%
Example