-93.85% is the change from 650 to 40
Calculation steps:
[( 40 - 650 ) ÷ 650] x 100 = -93.85%
Formula
Percentage change = [(40 - 650) / 650] x 100
Subtract the new number by the original number
40 - 650 = -610
-610 ÷ 650 = -0.9384615384615385
-0.9384615384615385 x 100 = -93.85%