-50.99% is the change from 855 to 419
Calculation steps:
[( 419 - 855 ) ÷ 855] x 100 = -50.99%
Formula
Percentage change = [(419 - 855) / 855] x 100
Subtract the new number by the original number
419 - 855 = -436
-436 ÷ 855 = -0.5099415204678363
-0.5099415204678363 x 100 = -50.99%