-17.68% is the change from 328 to 270
Calculation steps:
[( 270 - 328 ) ÷ 328] x 100 = -17.68%
Formula
Percentage change = [(270 - 328) / 328] x 100
Subtract the new number by the original number
270 - 328 = -58
-58 ÷ 328 = -0.17682926829268292
-0.17682926829268292 x 100 = -17.68%