9800% is the change from 1 to 99
Calculation steps:
[( 99 - 1 ) ÷ 1] x 100 = 9800%
Formula
Percentage change = [(99 - 1) / 1] x 100
Subtract the new number by the original number
99 - 1 = 98
98 ÷ 1 = 98
98 x 100 = 9800%
Example