400.99% is the change from 101 to 506
Calculation steps:
[( 506 - 101 ) ÷ 101] x 100 = 400.99%
Formula
Percentage change = [(506 - 101) / 101] x 100
Subtract the new number by the original number
506 - 101 = 405
405 ÷ 101 = 4.00990099009901
4.00990099009901 x 100 = 400.99%