6561.54% is the change from 13 to 866
Calculation steps:
[( 866 - 13 ) ÷ 13] x 100 = 6561.54%
Formula
Percentage change = [(866 - 13) / 13] x 100
Subtract the new number by the original number
866 - 13 = 853
853 ÷ 13 = 65.61538461538461
65.61538461538461 x 100 = 6561.54%