102.62% is the change from 420 to 851
Calculation steps:
[( 851 - 420 ) ÷ 420] x 100 = 102.62%
Formula
Percentage change = [(851 - 420) / 420] x 100
Subtract the new number by the original number
851 - 420 = 431
431 ÷ 420 = 1.026190476190476
1.026190476190476 x 100 = 102.62%