-13.5% is the change from 489 to 423
Calculation steps:
[( 423 - 489 ) ÷ 489] x 100 = -13.5%
Formula
Percentage change = [(423 - 489) / 489] x 100
Subtract the new number by the original number
423 - 489 = -66
-66 ÷ 489 = -0.13496932515337423
-0.13496932515337423 x 100 = -13.5%