-94.19% is the change from 688 to 40
Calculation steps:
[( 40 - 688 ) ÷ 688] x 100 = -94.19%
Formula
Percentage change = [(40 - 688) / 688] x 100
Subtract the new number by the original number
40 - 688 = -648
-648 ÷ 688 = -0.9418604651162791
-0.9418604651162791 x 100 = -94.19%