Please explain how to get answer 0.1387

Suppose that two factors have been identified for the U.S. economy: the growth rate of industrial production, IP, and the inflation rate, IR. IP is expected to be 3.8%, and IR 3.9%. A stock with a beta of 1.1 on IP and .5 on IR currently is expected to provide a rate of return of 13%. If industrial production actually grows by 5%, while the inflation rate turns out to be 3%, what is the actual rate of return on the stock