-50% is the change from 770 to 385
Calculation steps:
[( 385 - 770 ) ÷ 770] x 100 = -50%
Formula
Percentage change = [(385 - 770) / 770] x 100
Subtract the new number by the original number
385 - 770 = -385
-385 ÷ 770 = -0.5
-0.5 x 100 = -50%
Example