-50% is the change from 786 to 393
Calculation steps:
[( 393 - 786 ) ÷ 786] x 100 = -50%
Formula
Percentage change = [(393 - 786) / 786] x 100
Subtract the new number by the original number
393 - 786 = -393
-393 ÷ 786 = -0.5
-0.5 x 100 = -50%
Example