-29.76% is the change from 457 to 321
Calculation steps:
[( 321 - 457 ) ÷ 457] x 100 = -29.76%
Formula
Percentage change = [(321 - 457) / 457] x 100
Subtract the new number by the original number
321 - 457 = -136
-136 ÷ 457 = -0.2975929978118162
-0.2975929978118162 x 100 = -29.76%