-95% is the change from 40 to 2
Calculation steps:
[( 2 - 40 ) ÷ 40] x 100 = -95%
Formula
Percentage change = [(2 - 40) / 40] x 100
Subtract the new number by the original number
2 - 40 = -38
-38 ÷ 40 = -0.95
-0.95 x 100 = -95%
Example