1239.06% is the change from 64 to 857
Calculation steps:
[( 857 - 64 ) ÷ 64] x 100 = 1239.06%
Formula
Percentage change = [(857 - 64) / 64] x 100
Subtract the new number by the original number
857 - 64 = 793
793 ÷ 64 = 12.390625
12.390625 x 100 = 1239.06%