-17.32% is the change from 508 to 420
Calculation steps:
[( 420 - 508 ) ÷ 508] x 100 = -17.32%
Formula
Percentage change = [(420 - 508) / 508] x 100
Subtract the new number by the original number
420 - 508 = -88
-88 ÷ 508 = -0.1732283464566929
-0.1732283464566929 x 100 = -17.32%