-32% is the change from 850 to 578
Calculation steps:
[( 578 - 850 ) ÷ 850] x 100 = -32%
Formula
Percentage change = [(578 - 850) / 850] x 100
Subtract the new number by the original number
578 - 850 = -272
-272 ÷ 850 = -0.32
-0.32 x 100 = -32%
Example