-94.03% is the change from 670 to 40
Calculation steps:
[( 40 - 670 ) ÷ 670] x 100 = -94.03%
Formula
Percentage change = [(40 - 670) / 670] x 100
Subtract the new number by the original number
40 - 670 = -630
-630 ÷ 670 = -0.9402985074626866
-0.9402985074626866 x 100 = -94.03%