The stock of Business Adventures sells for $60 a share. Its likely dividend payout and end-of yeat price depend on the state of the economy by the end of the year as follows: Required: a. Calculate the expected holding period return and standard deviation of the holding-period return. All three scenarios are equally likely. (Do not round intermediate calculotions. Round your answers to 2 decimal places.) b. Calculate the expected retum and standard deviation of a portfolio invested half in Business Adventures and half.in Treasury bills. The return on bills is 4%. (Do not round intermediote colculotions. Round your answers to 2 decimal places.)