Discuss fully the law relating to supervening impossibility of performance, referring to the reported cases. Having completed your discussion, comment on the legal position in the following cases. (a) Tyler agrees to replace the bathroom and kitchen tiles in Omys luxury mansion with a brand of high quality imported tiles. The parties agree that the work must be finished by 1 June and penalty of R1 000 will be payable for each day that the work remains uncompleted after 1 June. When Tyler calls on Central Tile Supplies (from whom he obtained a quote for the tiles prior to contracting with Omy), he is told that the firms stocks have run out and that the next consignment of this type of tile will be only arriving from overseas on 30 June. Tyler can obtain the tiles from another supplier in Cape Town, but at double the cost. He had not anticipated supply problems when he quoted his price, and he now stands to make a loss on the contract. Omy threatens that he will enforce the penalty clause or sue for damages if the work is not done on time. (b) Selby of Selby Motors agrees to sell a second-hand motor car to Biyah for R50 000. The parties agree that Selby will put new tyres on the car and do certain other minor repairs and that Biyah will bring a cheque for the price when he calls to collect the car at the end of the week. Later that day, when Selbys employee takes the car across town to have new tyres put on it, he negligently collides with a bus, and the car is damaged beyond repair. Selby argues that he is excused from liability in terms of the contract because the subject matter has effectively been destroyed. (c) Hettie agrees to hire a vehicle from Larry for a period of 1 year. Shortly after taking delivery of the car, Hettie negligently collides with a lamp post, leaving the vehicle damaged beyond repair. Hettie maintains that, because she no longer has use of the vehicle, she is excused from liability in respect of the monthly rent. Larry does not agree. (d) Dicey Stores order 20 TV sets from Dazzle TV Suppliers. The day before the sets are to be delivered, the premises of Dazzle TV Suppliers are flooded during a heavy downpour and 10 of the TV sets are damaged beyond repair