Using the tax shield approach, calculate OCF given the following information: Sales $182,000; Costs $49,000; Depreciation $12,000. The tax rate is 35%. $100,400 $78,600 $82,200 $90,650 You would like to combine a risky stock with a beta of 1.8 with Treasury bills in such a way that the risk level of the portfolio is equivalent to the risk level of the overall market. What percentage of the portfolio should be invested in Treasury bills? 49% 44% 38% 33%