6361.54% is the change from 13 to 840
Calculation steps:
[( 840 - 13 ) ÷ 13] x 100 = 6361.54%
Formula
Percentage change = [(840 - 13) / 13] x 100
Subtract the new number by the original number
840 - 13 = 827
827 ÷ 13 = 63.61538461538461
63.61538461538461 x 100 = 6361.54%