-91.29% is the change from 310 to 27
Calculation steps:
[( 27 - 310 ) ÷ 310] x 100 = -91.29%
Formula
Percentage change = [(27 - 310) / 310] x 100
Subtract the new number by the original number
27 - 310 = -283
-283 ÷ 310 = -0.9129032258064517
-0.9129032258064517 x 100 = -91.29%