Legal Principle: An agreement, the meaning of which is not certain, or capable of being made certain, is void.
Factual Situation: M offered to sell his land to N at 280.Nrepliedacceptingtheofferandenclosing30 and promising to pay the balance amount by monthly installments of $50 each.Since N accepted the offer subject to making payments in installments.
Issue: Is there a valid contract?