398.02% is the change from 101 to 503
Calculation steps:
[( 503 - 101 ) ÷ 101] x 100 = 398.02%
Formula
Percentage change = [(503 - 101) / 101] x 100
Subtract the new number by the original number
503 - 101 = 402
402 ÷ 101 = 3.98019801980198
3.98019801980198 x 100 = 398.02%