-35.31% is the change from 320 to 207
Calculation steps:
[( 207 - 320 ) ÷ 320] x 100 = -35.31%
Formula
Percentage change = [(207 - 320) / 320] x 100
Subtract the new number by the original number
207 - 320 = -113
-113 ÷ 320 = -0.353125
-0.353125 x 100 = -35.31%