-94.44% is the change from 270 to 15
Calculation steps:
[( 15 - 270 ) ÷ 270] x 100 = -94.44%
Formula
Percentage change = [(15 - 270) / 270] x 100
Subtract the new number by the original number
15 - 270 = -255
-255 ÷ 270 = -0.9444444444444444
-0.9444444444444444 x 100 = -94.44%