-15.36% is the change from 319 to 270
Calculation steps:
[( 270 - 319 ) ÷ 319] x 100 = -15.36%
Formula
Percentage change = [(270 - 319) / 319] x 100
Subtract the new number by the original number
270 - 319 = -49
-49 ÷ 319 = -0.1536050156739812
-0.1536050156739812 x 100 = -15.36%