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12. An investor can design a risky portfolio based on two stocks, A and B. The standard deviation of return on stock A is 25%, while the standard deviation on stock B is 42% The correlation coefficient between the returns on A and B is 345. The expected retum on stock A is 9.75%, while on stock B it is 21.5%. The proportion of stock A invested in the optimal risky portfolio using these two stocks should approximately be Consider following characteristic of a bond Time to Maturity: 5 years Coupon Payment: Semi-annual Coupon Rate: 6.2% Par Value: $1,000 YTM (in annual): 3.5% 15. What the Macaulay's duration and modified duration for 1% yield change for this bond given the information