-64.25% is the change from 856 to 306
Calculation steps:
[( 306 - 856 ) ÷ 856] x 100 = -64.25%
Formula
Percentage change = [(306 - 856) / 856] x 100
Subtract the new number by the original number
306 - 856 = -550
-550 ÷ 856 = -0.6425233644859814
-0.6425233644859814 x 100 = -64.25%