-64.33% is the change from 855 to 305
Calculation steps:
[( 305 - 855 ) ÷ 855] x 100 = -64.33%
Formula
Percentage change = [(305 - 855) / 855] x 100
Subtract the new number by the original number
305 - 855 = -550
-550 ÷ 855 = -0.6432748538011696
-0.6432748538011696 x 100 = -64.33%