State of Economy Probability of State of Economy Security Returns if State Occurs $($Roll$)$ Security Returns if State Occurs $($Ross$)$

Bust $0\mathrm{.}4010\%21\%$

Boom $0\mathrm{.}6028\%18\%$

Use the above information on states of the economy and stock returns to calculate the percentage expected return on a portfolio of $55$ percent Roll and $45$ percent Ross.