Eric promises Samuel $$40,000$ if he graduates from UCO. Samuel enrolls in UCO, attends full$-$time for four years, and graduates. When Samuel asks Eric for $$40,000,$ Eric says, $$I don$$t re$$member promising you $$40,000.$ But if there was a promise, it$$s not enforceable, because we didn$$t bargain for it$.$ And even if there was a prom$$ise that would otherwise be enforceable, I revoke it now.$$

Can Samuel en$$force Eric$$s $$prom$$ise$?$ Why or why not? Explain your answer thoroughly using logic and the information you learned in your textbook and Online lectures. Cite any information that you did not originate.