-17.5% is the change from 600 to 495
Calculation steps:
[( 495 - 600 ) ÷ 600] x 100 = -17.5%
Formula
Percentage change = [(495 - 600) / 600] x 100
Subtract the new number by the original number
495 - 600 = -105
-105 ÷ 600 = -0.175
-0.175 x 100 = -17.5%