Sam, Sue, and Shelley formed a partnership. Sam received a 50 percent interest in the partnership in exchange for land with an adjusted basis to him of $30,000 and a fair market value of $50,000. Sue received a 25 percent interest in the partnership in exchange for $25,000 of cash. Shelley received a 25 percent interest in the partnership in exchange for $25,000 of cash. Three years after the date of contribution, the land contributed by Sam was sold by the partnership to an unrelated third party for $90,000. Under the traditional method, how much gain was required to be allocated to Sam as a result of the sale by the partnership?

Group of answer choices

$20,000

$30,000

$40,000

$60,000