-64.4% is the change from 899 to 320
Calculation steps:
[( 320 - 899 ) ÷ 899] x 100 = -64.4%
Formula
Percentage change = [(320 - 899) / 899] x 100
Subtract the new number by the original number
320 - 899 = -579
-579 ÷ 899 = -0.6440489432703004
-0.6440489432703004 x 100 = -64.4%