6691.67% is the change from 12 to 815
Calculation steps:
[( 815 - 12 ) ÷ 12] x 100 = 6691.67%
Formula
Percentage change = [(815 - 12) / 12] x 100
Subtract the new number by the original number
815 - 12 = 803
803 ÷ 12 = 66.91666666666667
66.91666666666667 x 100 = 6691.67%