-30.82% is the change from 503 to 348
Calculation steps:
[( 348 - 503 ) ÷ 503] x 100 = -30.82%
Formula
Percentage change = [(348 - 503) / 503] x 100
Subtract the new number by the original number
348 - 503 = -155
-155 ÷ 503 = -0.3081510934393638
-0.3081510934393638 x 100 = -30.82%