-34.2% is the change from 500 to 329
Calculation steps:
[( 329 - 500 ) ÷ 500] x 100 = -34.2%
Formula
Percentage change = [(329 - 500) / 500] x 100
Subtract the new number by the original number
329 - 500 = -171
-171 ÷ 500 = -0.342
-0.342 x 100 = -34.2%