-50% is the change from 378 to 189
Calculation steps:
[( 189 - 378 ) ÷ 378] x 100 = -50%
Formula
Percentage change = [(189 - 378) / 378] x 100
Subtract the new number by the original number
189 - 378 = -189
-189 ÷ 378 = -0.5
-0.5 x 100 = -50%
Example