-39.56% is the change from 503 to 304
Calculation steps:
[( 304 - 503 ) ÷ 503] x 100 = -39.56%
Formula
Percentage change = [(304 - 503) / 503] x 100
Subtract the new number by the original number
304 - 503 = -199
-199 ÷ 503 = -0.3956262425447316
-0.3956262425447316 x 100 = -39.56%