439.56% is the change from 91 to 491
Calculation steps:
[( 491 - 91 ) ÷ 91] x 100 = 439.56%
Formula
Percentage change = [(491 - 91) / 91] x 100
Subtract the new number by the original number
491 - 91 = 400
400 ÷ 91 = 4.395604395604396
4.395604395604396 x 100 = 439.56%