-79.88% is the change from 497 to 100
Calculation steps:
[( 100 - 497 ) ÷ 497] x 100 = -79.88%
Formula
Percentage change = [(100 - 497) / 497] x 100
Subtract the new number by the original number
100 - 497 = -397
-397 ÷ 497 = -0.7987927565392354
-0.7987927565392354 x 100 = -79.88%