420% is the change from 155 to 806
Calculation steps:
[( 806 - 155 ) ÷ 155] x 100 = 420%
Formula
Percentage change = [(806 - 155) / 155] x 100
Subtract the new number by the original number
806 - 155 = 651
651 ÷ 155 = 4.2
4.2 x 100 = 420%
Example