50.3% is the change from 503 to 756
Calculation steps:
[( 756 - 503 ) ÷ 503] x 100 = 50.3%
Formula
Percentage change = [(756 - 503) / 503] x 100
Subtract the new number by the original number
756 - 503 = 253
253 ÷ 503 = 0.5029821073558648
0.5029821073558648 x 100 = 50.3%