-49.23% is the change from 390 to 198
Calculation steps:
[( 198 - 390 ) ÷ 390] x 100 = -49.23%
Formula
Percentage change = [(198 - 390) / 390] x 100
Subtract the new number by the original number
198 - 390 = -192
-192 ÷ 390 = -0.49230769230769234
-0.49230769230769234 x 100 = -49.23%