50.5% is the change from 503 to 757
Calculation steps:
[( 757 - 503 ) ÷ 503] x 100 = 50.5%
Formula
Percentage change = [(757 - 503) / 503] x 100
Subtract the new number by the original number
757 - 503 = 254
254 ÷ 503 = 0.5049701789264414
0.5049701789264414 x 100 = 50.5%