-91.95% is the change from 497 to 40
Calculation steps:
[( 40 - 497 ) ÷ 497] x 100 = -91.95%
Formula
Percentage change = [(40 - 497) / 497] x 100
Subtract the new number by the original number
40 - 497 = -457
-457 ÷ 497 = -0.9195171026156942
-0.9195171026156942 x 100 = -91.95%