663.64% is the change from 55 to 420
Calculation steps:
[( 420 - 55 ) ÷ 55] x 100 = 663.64%
Formula
Percentage change = [(420 - 55) / 55] x 100
Subtract the new number by the original number
420 - 55 = 365
365 ÷ 55 = 6.636363636363637
6.636363636363637 x 100 = 663.64%