3100% is the change from 27 to 864
Calculation steps:
[( 864 - 27 ) ÷ 27] x 100 = 3100%
Formula
Percentage change = [(864 - 27) / 27] x 100
Subtract the new number by the original number
864 - 27 = 837
837 ÷ 27 = 31
31 x 100 = 3100%
Example