-42.94% is the change from 850 to 485
Calculation steps:
[( 485 - 850 ) ÷ 850] x 100 = -42.94%
Formula
Percentage change = [(485 - 850) / 850] x 100
Subtract the new number by the original number
485 - 850 = -365
-365 ÷ 850 = -0.4294117647058823
-0.4294117647058823 x 100 = -42.94%