997.78% is the change from 90 to 988
Calculation steps:
[( 988 - 90 ) ÷ 90] x 100 = 997.78%
Formula
Percentage change = [(988 - 90) / 90] x 100
Subtract the new number by the original number
988 - 90 = 898
898 ÷ 90 = 9.977777777777778
9.977777777777778 x 100 = 997.78%