Promise Inc. stock has a 40% chance of producing a 15% return, a 30% chance of producing a 10% return, and a 30% chance of producing a -8% return (losing 8%). What is the firm's expected rate of return?Promise Inc. stock has a 40% chance of producing a 15% return, a 30% chance of producing a 10% return, and a 30% chance of producing a -8% return (losing 8%). What is the firm's expected rate of return?