987.78% is the change from 90 to 979
Calculation steps:
[( 979 - 90 ) ÷ 90] x 100 = 987.78%
Formula
Percentage change = [(979 - 90) / 90] x 100
Subtract the new number by the original number
979 - 90 = 889
889 ÷ 90 = 9.877777777777778
9.877777777777778 x 100 = 987.78%