-95.98% is the change from 497 to 20
Calculation steps:
[( 20 - 497 ) ÷ 497] x 100 = -95.98%
Formula
Percentage change = [(20 - 497) / 497] x 100
Subtract the new number by the original number
20 - 497 = -477
-477 ÷ 497 = -0.959758551307847
-0.959758551307847 x 100 = -95.98%