-30.77% is the change from 455 to 315
Calculation steps:
[( 315 - 455 ) ÷ 455] x 100 = -30.77%
Formula
Percentage change = [(315 - 455) / 455] x 100
Subtract the new number by the original number
315 - 455 = -140
-140 ÷ 455 = -0.3076923076923077
-0.3076923076923077 x 100 = -30.77%