-50.3% is the change from 503 to 250
Calculation steps:
[( 250 - 503 ) ÷ 503] x 100 = -50.3%
Formula
Percentage change = [(250 - 503) / 503] x 100
Subtract the new number by the original number
250 - 503 = -253
-253 ÷ 503 = -0.5029821073558648
-0.5029821073558648 x 100 = -50.3%