1148.75% is the change from 80 to 999
Calculation steps:
[( 999 - 80 ) ÷ 80] x 100 = 1148.75%
Formula
Percentage change = [(999 - 80) / 80] x 100
Subtract the new number by the original number
999 - 80 = 919
919 ÷ 80 = 11.4875
11.4875 x 100 = 1148.75%