-42.35% is the change from 850 to 490
Calculation steps:
[( 490 - 850 ) ÷ 850] x 100 = -42.35%
Formula
Percentage change = [(490 - 850) / 850] x 100
Subtract the new number by the original number
490 - 850 = -360
-360 ÷ 850 = -0.4235294117647059
-0.4235294117647059 x 100 = -42.35%