-32.8% is the change from 500 to 336
Calculation steps:
[( 336 - 500 ) ÷ 500] x 100 = -32.8%
Formula
Percentage change = [(336 - 500) / 500] x 100
Subtract the new number by the original number
336 - 500 = -164
-164 ÷ 500 = -0.328
-0.328 x 100 = -32.8%