-57.81% is the change from 320 to 135
Calculation steps:
[( 135 - 320 ) ÷ 320] x 100 = -57.81%
Formula
Percentage change = [(135 - 320) / 320] x 100
Subtract the new number by the original number
135 - 320 = -185
-185 ÷ 320 = -0.578125
-0.578125 x 100 = -57.81%