-49.43% is the change from 789 to 399
Calculation steps:
[( 399 - 789 ) ÷ 789] x 100 = -49.43%
Formula
Percentage change = [(399 - 789) / 789] x 100
Subtract the new number by the original number
399 - 789 = -390
-390 ÷ 789 = -0.49429657794676807
-0.49429657794676807 x 100 = -49.43%