-91.18% is the change from 306 to 27
Calculation steps:
[( 27 - 306 ) ÷ 306] x 100 = -91.18%
Formula
Percentage change = [(27 - 306) / 306] x 100
Subtract the new number by the original number
27 - 306 = -279
-279 ÷ 306 = -0.9117647058823529
-0.9117647058823529 x 100 = -91.18%