-91% is the change from 300 to 27
Calculation steps:
[( 27 - 300 ) ÷ 300] x 100 = -91%
Formula
Percentage change = [(27 - 300) / 300] x 100
Subtract the new number by the original number
27 - 300 = -273
-273 ÷ 300 = -0.91
-0.91 x 100 = -91%
Example