-89.9% is the change from 297 to 30
Calculation steps:
[( 30 - 297 ) ÷ 297] x 100 = -89.9%
Formula
Percentage change = [(30 - 297) / 297] x 100
Subtract the new number by the original number
30 - 297 = -267
-267 ÷ 297 = -0.898989898989899
-0.898989898989899 x 100 = -89.9%