413.41% is the change from 82 to 421
Calculation steps:
[( 421 - 82 ) ÷ 82] x 100 = 413.41%
Formula
Percentage change = [(421 - 82) / 82] x 100
Subtract the new number by the original number
421 - 82 = 339
339 ÷ 82 = 4.134146341463414
4.134146341463414 x 100 = 413.41%