-43.44% is the change from 320 to 181
Calculation steps:
[( 181 - 320 ) ÷ 320] x 100 = -43.44%
Formula
Percentage change = [(181 - 320) / 320] x 100
Subtract the new number by the original number
181 - 320 = -139
-139 ÷ 320 = -0.434375
-0.434375 x 100 = -43.44%