102.14% is the change from 421 to 851
Calculation steps:
[( 851 - 421 ) ÷ 421] x 100 = 102.14%
Formula
Percentage change = [(851 - 421) / 421] x 100
Subtract the new number by the original number
851 - 421 = 430
430 ÷ 421 = 1.0213776722090262
1.0213776722090262 x 100 = 102.14%