-91.22% is the change from 900 to 79
Calculation steps:
[( 79 - 900 ) ÷ 900] x 100 = -91.22%
Formula
Percentage change = [(79 - 900) / 900] x 100
Subtract the new number by the original number
79 - 900 = -821
-821 ÷ 900 = -0.9122222222222223
-0.9122222222222223 x 100 = -91.22%