-38.65% is the change from 502 to 308
Calculation steps:
[( 308 - 502 ) ÷ 502] x 100 = -38.65%
Formula
Percentage change = [(308 - 502) / 502] x 100
Subtract the new number by the original number
308 - 502 = -194
-194 ÷ 502 = -0.38645418326693226
-0.38645418326693226 x 100 = -38.65%