-23.64% is the change from 423 to 323
Calculation steps:
[( 323 - 423 ) ÷ 423] x 100 = -23.64%
Formula
Percentage change = [(323 - 423) / 423] x 100
Subtract the new number by the original number
323 - 423 = -100
-100 ÷ 423 = -0.2364066193853428
-0.2364066193853428 x 100 = -23.64%