21. You have been delivering office supplies to Ace Manufacturing Inc, for a number of years. The supplies are delivered on a weekly basis and then a purchase order is sent to Ace. They have always paid in the past within three to four weeks, but the last delivery, totalling $5,000, they did not pay for. Is has now been 45 days since the delivery was made. You have taken the position that payment was due no later than 30 days after delivery. Ace has taken the position that the payment is not late, as the contract between you is silent as to payment time. A lawsuit has been started, and the judge will have to Interpret the contract between your company and Acc. In connection with the foregoing, please answer the following questions ($ marks totally: (a) List and describe three methods (doctrines) that the judge can use to determine whether to imply terms into a contract (do not use statutes]]G marks), [b) Which one would the judge probably use in the circumstances and why? (2 marks)