-87.77% is the change from 319 to 39
Calculation steps:
[( 39 - 319 ) ÷ 319] x 100 = -87.77%
Formula
Percentage change = [(39 - 319) / 319] x 100
Subtract the new number by the original number
39 - 319 = -280
-280 ÷ 319 = -0.877742946708464
-0.877742946708464 x 100 = -87.77%