Aperson wants to invest $10,000 into stocks: a high tech company (t) with an expected annual return of 12% and a risk index of 8; and a regulated power company (p) with an expected annual return of 6% and a risk index of 2. to limit risk, the combined portfolio risk must be no more than 6 and the proportion of investment in t must be less than 60%. find the portfolio that will maximize the annual return r while meeting the risk limitations. homework 10a (10 points): formulate the investment portfolio problem with the requirement of investing up to $10,000, and solve it graphically. homework 10b (5 points): compute the increase in annual return if the total investment is increased by $1,000.homework 10c (5 points): compute the increase in annual return if the constraint of portfolio risk index is increased from 6 to 7.