1210.94% is the change from 64 to 839
Calculation steps:
[( 839 - 64 ) ÷ 64] x 100 = 1210.94%
Formula
Percentage change = [(839 - 64) / 64] x 100
Subtract the new number by the original number
839 - 64 = 775
775 ÷ 64 = 12.109375
12.109375 x 100 = 1210.94%