-16.33% is the change from 502 to 420
Calculation steps:
[( 420 - 502 ) ÷ 502] x 100 = -16.33%
Formula
Percentage change = [(420 - 502) / 502] x 100
Subtract the new number by the original number
420 - 502 = -82
-82 ÷ 502 = -0.16334661354581673
-0.16334661354581673 x 100 = -16.33%