-91.51% is the change from 318 to 27
Calculation steps:
[( 27 - 318 ) ÷ 318] x 100 = -91.51%
Formula
Percentage change = [(27 - 318) / 318] x 100
Subtract the new number by the original number
27 - 318 = -291
-291 ÷ 318 = -0.9150943396226415
-0.9150943396226415 x 100 = -91.51%