-16.24% is the change from 505 to 423
Calculation steps:
[( 423 - 505 ) ÷ 505] x 100 = -16.24%
Formula
Percentage change = [(423 - 505) / 505] x 100
Subtract the new number by the original number
423 - 505 = -82
-82 ÷ 505 = -0.16237623762376238
-0.16237623762376238 x 100 = -16.24%