-89.69% is the change from 291 to 30
Calculation steps:
[( 30 - 291 ) ÷ 291] x 100 = -89.69%
Formula
Percentage change = [(30 - 291) / 291] x 100
Subtract the new number by the original number
30 - 291 = -261
-261 ÷ 291 = -0.8969072164948454
-0.8969072164948454 x 100 = -89.69%