-30.95% is the change from 391 to 270
Calculation steps:
[( 270 - 391 ) ÷ 391] x 100 = -30.95%
Formula
Percentage change = [(270 - 391) / 391] x 100
Subtract the new number by the original number
270 - 391 = -121
-121 ÷ 391 = -0.309462915601023
-0.309462915601023 x 100 = -30.95%