please answer with percentages as decimals. previously posted this question but the expert did not answer part C. please answer part C as well

Question 3: You have the following assets available to you: Asset Expected Return Riskless Debt 3.5% Market portfolio 10% Well diversified portfolio of firms exposed to oil 11% prices Well-diversified portfolio of firms with no 9% exposure to oil prices Well-diversified portfolio of firms exposed to 14% gold prices Well-diversified portfolio of firms with no 13.4% exposure to gold prices a. : What is the value of the gold factor you can construct with these assets? b. : What is the value of the value of the oil factor you can construct with these assets? c. You are attempting to find the cost of equity for a firm using a factor model with the following factors and betas: I Factor CAPM market factor Gold factor from Part A Oil factor from Part B Beta 1.1 1.6 0.8 What would you estimate this firm's cost of equity to be