325.25% is the change from 99 to 421
Calculation steps:
[( 421 - 99 ) ÷ 99] x 100 = 325.25%
Formula
Percentage change = [(421 - 99) / 99] x 100
Subtract the new number by the original number
421 - 99 = 322
322 ÷ 99 = 3.2525252525252526
3.2525252525252526 x 100 = 325.25%