-29.79% is the change from 329 to 231
Calculation steps:
[( 231 - 329 ) ÷ 329] x 100 = -29.79%
Formula
Percentage change = [(231 - 329) / 329] x 100
Subtract the new number by the original number
231 - 329 = -98
-98 ÷ 329 = -0.2978723404255319
-0.2978723404255319 x 100 = -29.79%