Do you want a decimal, a fraction form, or the exact repeating decimal? Here are the main forms:
Simplest form: 12/89 (already in lowest terms; gcd(12,89)=1).
Decimal approximation (finite digits): 0.13483146...
Exact repeating decimal: 12/89 = 0.(13483146067415730337078651685393258426966292192) repeating every 44 digits.
If you only need a few digits: 12/89 ≈ 0.13483146 or ≈ 13.483146%.
If you want more digits or a specific format, tell me.