-29.5% is the change from 600 to 423
Calculation steps:
[( 423 - 600 ) ÷ 600] x 100 = -29.5%
Formula
Percentage change = [(423 - 600) / 600] x 100
Subtract the new number by the original number
423 - 600 = -177
-177 ÷ 600 = -0.295
-0.295 x 100 = -29.5%