55.86% is the change from 503 to 784
Calculation steps:
[( 784 - 503 ) ÷ 503] x 100 = 55.86%
Formula
Percentage change = [(784 - 503) / 503] x 100
Subtract the new number by the original number
784 - 503 = 281
281 ÷ 503 = 0.558648111332008
0.558648111332008 x 100 = 55.86%