6400% is the change from 13 to 845
Calculation steps:
[( 845 - 13 ) ÷ 13] x 100 = 6400%
Formula
Percentage change = [(845 - 13) / 13] x 100
Subtract the new number by the original number
845 - 13 = 832
832 ÷ 13 = 64
64 x 100 = 6400%
Example