3769.23% is the change from 13 to 503
Calculation steps:
[( 503 - 13 ) ÷ 13] x 100 = 3769.23%
Formula
Percentage change = [(503 - 13) / 13] x 100
Subtract the new number by the original number
503 - 13 = 490
490 ÷ 13 = 37.69230769230769
37.69230769230769 x 100 = 3769.23%