6446.15% is the change from 13 to 851
Calculation steps:
[( 851 - 13 ) ÷ 13] x 100 = 6446.15%
Formula
Percentage change = [(851 - 13) / 13] x 100
Subtract the new number by the original number
851 - 13 = 838
838 ÷ 13 = 64.46153846153847
64.46153846153847 x 100 = 6446.15%