-40.63% is the change from 320 to 190
Calculation steps:
[( 190 - 320 ) ÷ 320] x 100 = -40.63%
Formula
Percentage change = [(190 - 320) / 320] x 100
Subtract the new number by the original number
190 - 320 = -130
-130 ÷ 320 = -0.40625
-0.40625 x 100 = -40.63%