1003.9% is the change from 77 to 850
Calculation steps:
[( 850 - 77 ) ÷ 77] x 100 = 1003.9%
Formula
Percentage change = [(850 - 77) / 77] x 100
Subtract the new number by the original number
850 - 77 = 773
773 ÷ 77 = 10.03896103896104
10.03896103896104 x 100 = 1003.9%