-29.98% is the change from 457 to 320
Calculation steps:
[( 320 - 457 ) ÷ 457] x 100 = -29.98%
Formula
Percentage change = [(320 - 457) / 457] x 100
Subtract the new number by the original number
320 - 457 = -137
-137 ÷ 457 = -0.29978118161925604
-0.29978118161925604 x 100 = -29.98%