-50.78% is the change from 768 to 378
Calculation steps:
[( 378 - 768 ) ÷ 768] x 100 = -50.78%
Formula
Percentage change = [(378 - 768) / 768] x 100
Subtract the new number by the original number
378 - 768 = -390
-390 ÷ 768 = -0.5078125
-0.5078125 x 100 = -50.78%