418.52% is the change from 81 to 420
Calculation steps:
[( 420 - 81 ) ÷ 81] x 100 = 418.52%
Formula
Percentage change = [(420 - 81) / 81] x 100
Subtract the new number by the original number
420 - 81 = 339
339 ÷ 81 = 4.185185185185185
4.185185185185185 x 100 = 418.52%