A company's common stock shares are expected to bring a 13 % return to their investors in case of "recession" state of the economy, 6 % return in case of "normal" state of the economy, and result in a 4 % loss in case of "boom" state of the economy. The probability of "boom" is 5 % and the probability of "recession" is 45 %. Calculate the expected rate of return on this company's common stock