7100% is the change from 12 to 864
Calculation steps:
[( 864 - 12 ) ÷ 12] x 100 = 7100%
Formula
Percentage change = [(864 - 12) / 12] x 100
Subtract the new number by the original number
864 - 12 = 852
852 ÷ 12 = 71
71 x 100 = 7100%
Example