XI. Zeny and Nolan were best friends for a long time already. Zeny borrowed ₱10,000.00 from Nolan, evidenced by a promissory note whereby Zeny promised to pay the loan "once his means permit." Two months later, they had a quarrel that broke their long-standing friendship. Nolan seeks your advice on how to collect from Zeny despite the tenor of the promissory note. What will your advice be? Explain your answer. (3%)