-35.63% is the change from 320 to 206
Calculation steps:
[( 206 - 320 ) ÷ 320] x 100 = -35.63%
Formula
Percentage change = [(206 - 320) / 320] x 100
Subtract the new number by the original number
206 - 320 = -114
-114 ÷ 320 = -0.35625
-0.35625 x 100 = -35.63%