-49.49% is the change from 390 to 197
Calculation steps:
[( 197 - 390 ) ÷ 390] x 100 = -49.49%
Formula
Percentage change = [(197 - 390) / 390] x 100
Subtract the new number by the original number
197 - 390 = -193
-193 ÷ 390 = -0.4948717948717949
-0.4948717948717949 x 100 = -49.49%