-38.13% is the change from 320 to 198
Calculation steps:
[( 198 - 320 ) ÷ 320] x 100 = -38.13%
Formula
Percentage change = [(198 - 320) / 320] x 100
Subtract the new number by the original number
198 - 320 = -122
-122 ÷ 320 = -0.38125
-0.38125 x 100 = -38.13%