21.23% is the change from 405 to 491
Calculation steps:
[( 491 - 405 ) ÷ 405] x 100 = 21.23%
Formula
Percentage change = [(491 - 405) / 405] x 100
Subtract the new number by the original number
491 - 405 = 86
86 ÷ 405 = 0.2123456790123457
0.2123456790123457 x 100 = 21.23%