-15.49% is the change from 497 to 420
Calculation steps:
[( 420 - 497 ) ÷ 497] x 100 = -15.49%
Formula
Percentage change = [(420 - 497) / 497] x 100
Subtract the new number by the original number
420 - 497 = -77
-77 ÷ 497 = -0.15492957746478872
-0.15492957746478872 x 100 = -15.49%