3.07% is the change from 488 to 503
Calculation steps:
[( 503 - 488 ) ÷ 488] x 100 = 3.07%
Formula
Percentage change = [(503 - 488) / 488] x 100
Subtract the new number by the original number
503 - 488 = 15
15 ÷ 488 = 0.030737704918032786
0.030737704918032786 x 100 = 3.07%