-48.85% is the change from 780 to 399
Calculation steps:
[( 399 - 780 ) ÷ 780] x 100 = -48.85%
Formula
Percentage change = [(399 - 780) / 780] x 100
Subtract the new number by the original number
399 - 780 = -381
-381 ÷ 780 = -0.48846153846153845
-0.48846153846153845 x 100 = -48.85%