28.83% is the change from 503 to 648
Calculation steps:
[( 648 - 503 ) ÷ 503] x 100 = 28.83%
Formula
Percentage change = [(648 - 503) / 503] x 100
Subtract the new number by the original number
648 - 503 = 145
145 ÷ 503 = 0.2882703777335984
0.2882703777335984 x 100 = 28.83%