-89.17% is the change from 277 to 30
Calculation steps:
[( 30 - 277 ) ÷ 277] x 100 = -89.17%
Formula
Percentage change = [(30 - 277) / 277] x 100
Subtract the new number by the original number
30 - 277 = -247
-247 ÷ 277 = -0.8916967509025271
-0.8916967509025271 x 100 = -89.17%