[4] Suppose that the following milestones apply to a hypothetical based on Brodgen v Metro Railway. Brogden supplies coal to Metro on a regular basis. On May 23, Brogden and Metro negotiated a draft concerning the supply of coal. Suppose that the following transactions take place April 2: Brogden shipped and Metro received 75,000 tons of coal May 2: Brogden shipped and Metro received 85,000 tons of coal May 22: Brogden shipped and Metro received 65,000 tons of coal June 2: Brodgen shipped but Metro rejected the delivery of 45,000 tons of coal July 2: Brogden shipped and Metro received 50,000 tons of coal August 2: Brogden shipped and Metro received 125,000 tons of coal [a] On what date, if any, does an implied contract between Brogden and Metro come into force? [b] What, if any, would be the contractual liability of Metro to Brogden. Answer in terms of aggregate tons [c] What effect, if any, did the event of June 2 have on that contractual liability? [5/6] If the Offensive Weapons Act reads as follows: "It is illegal to make an invitation to treat for, or to sell, any weapon as listed in this Act," which of the following would contravene this amended Act: