A loan portfolio contains both investment grade and sub-investment grade loans. The risk weight is 66% for the investment grade loan and 133% and the sub-investment grade. The regulatory capital requirement (capital/risk weighted assets) is 8%. What is the proportion of investment grade loan in the portfolio that makes the regulatory capital ratio equal 8%? Enter your answer as a percentage number but without the percentage sign "%" (Example, enter 10.50 for 10.50%; Do not enter "10.50%" or "0.1050")