-17% is the change from 506 to 420
Calculation steps:
[( 420 - 506 ) ÷ 506] x 100 = -17%
Formula
Percentage change = [(420 - 506) / 506] x 100
Subtract the new number by the original number
420 - 506 = -86
-86 ÷ 506 = -0.16996047430830039
-0.16996047430830039 x 100 = -17%