53.68% is the change from 503 to 773
Calculation steps:
[( 773 - 503 ) ÷ 503] x 100 = 53.68%
Formula
Percentage change = [(773 - 503) / 503] x 100
Subtract the new number by the original number
773 - 503 = 270
270 ÷ 503 = 0.536779324055666
0.536779324055666 x 100 = 53.68%