-90.09% is the change from 797 to 79
Calculation steps:
[( 79 - 797 ) ÷ 797] x 100 = -90.09%
Formula
Percentage change = [(79 - 797) / 797] x 100
Subtract the new number by the original number
79 - 797 = -718
-718 ÷ 797 = -0.9008782936010038
-0.9008782936010038 x 100 = -90.09%