53.28% is the change from 503 to 771
Calculation steps:
[( 771 - 503 ) ÷ 503] x 100 = 53.28%
Formula
Percentage change = [(771 - 503) / 503] x 100
Subtract the new number by the original number
771 - 503 = 268
268 ÷ 503 = 0.532803180914513
0.532803180914513 x 100 = 53.28%