To convert a fraction to a percentage, we need to multiply it by 100. So, to find the percentage of 9/8, we can multiply it by 100.

9/8 x 100 = 112.5%

Therefore, 9/8 as a percentage is 112.5%. This means that if we have a whole object or quantity, and we divide it into 8 equal parts, then 9 of those parts would be equivalent to 112.5% of the whole.