-29.42% is the change from 503 to 355
Calculation steps:
[( 355 - 503 ) ÷ 503] x 100 = -29.42%
Formula
Percentage change = [(355 - 503) / 503] x 100
Subtract the new number by the original number
355 - 503 = -148
-148 ÷ 503 = -0.294234592445328
-0.294234592445328 x 100 = -29.42%