491.21% is the change from 91 to 538
Calculation steps:
[( 538 - 91 ) ÷ 91] x 100 = 491.21%
Formula
Percentage change = [(538 - 91) / 91] x 100
Subtract the new number by the original number
538 - 91 = 447
447 ÷ 91 = 4.912087912087912
4.912087912087912 x 100 = 491.21%