-22.33% is the change from 506 to 393
Calculation steps:
[( 393 - 506 ) ÷ 506] x 100 = -22.33%
Formula
Percentage change = [(393 - 506) / 506] x 100
Subtract the new number by the original number
393 - 506 = -113
-113 ÷ 506 = -0.22332015810276679
-0.22332015810276679 x 100 = -22.33%