Sonny and cher were a popular singing duo in the 1970's. after establishing their success in the music business, they met to decide how future earnings should be split among the two partners. together, they could earn $5 million per year from their music act. separately, cher could earn $1 million as an actress, and sonny did not have any outside options for employment. how much of the $5 million joint earnings should be paid to cher? a. $1 million b. $2 million c. $2.5 million d. $3 million