988.89% is the change from 90 to 980
Calculation steps:
[( 980 - 90 ) ÷ 90] x 100 = 988.89%
Formula
Percentage change = [(980 - 90) / 90] x 100
Subtract the new number by the original number
980 - 90 = 890
890 ÷ 90 = 9.88888888888889
9.88888888888889 x 100 = 988.89%