-91.21% is the change from 455 to 40
Calculation steps:
[( 40 - 455 ) ÷ 455] x 100 = -91.21%
Formula
Percentage change = [(40 - 455) / 455] x 100
Subtract the new number by the original number
40 - 455 = -415
-415 ÷ 455 = -0.9120879120879121
-0.9120879120879121 x 100 = -91.21%