-91.1% is the change from 899 to 80
Calculation steps:
[( 80 - 899 ) ÷ 899] x 100 = -91.1%
Formula
Percentage change = [(80 - 899) / 899] x 100
Subtract the new number by the original number
80 - 899 = -819
-819 ÷ 899 = -0.9110122358175751
-0.9110122358175751 x 100 = -91.1%