-50.63% is the change from 790 to 390
Calculation steps:
[( 390 - 790 ) ÷ 790] x 100 = -50.63%
Formula
Percentage change = [(390 - 790) / 790] x 100
Subtract the new number by the original number
390 - 790 = -400
-400 ÷ 790 = -0.5063291139240507
-0.5063291139240507 x 100 = -50.63%