388.35% is the change from 103 to 503
Calculation steps:
[( 503 - 103 ) ÷ 103] x 100 = 388.35%
Formula
Percentage change = [(503 - 103) / 103] x 100
Subtract the new number by the original number
503 - 103 = 400
400 ÷ 103 = 3.883495145631068
3.883495145631068 x 100 = 388.35%