Question 4 (25 marks) Eli saw an advertisement for the sale of a second-hand carbon fibre bicycle for $2,000. The retail price of the same bicycle was $2,800. Eli arranged with Cheng, the seller, to view the bicycle. During the viewing, Cheng said that his bicycle was in "excellent condition" and that he had only used the bicycle twice. He decided to sell it because he had other bicycles. Eli checked the bicycle and was pleased with the condition. Three days later, Eli discovered that the brakes were not working properly. Fortunately, he managed to avoid an accident while riding the bicycle. Eli immediately contacted Cheng and asked for a refund. Cheng knew that the brakes were faulty but did not mention it during the viewing. He told Eli he could not have discovered the faulty brakes since he had only used the bicycle twice. Cheng said that the faulty brakes could be due to a manufacturer's defect and offered to pay for the costs of repairs. Eli reluctantly accepted Cheng's suggestion and arranged to have the brakes fixed by the distributor. Cheng paid for the cost of repairs. Josh, Eli's friend, accompanied Eli to collect his bicycle after the repairs were done. Josh was surprised that Eli paid $2,000 for a second-hand bicycle. Due to the Great Singapore Sale, that same model of bicycle was on sale for less than $2000. Josh advised Eli to return the bicycle and get a full refund from Cheng. Required: (a Define vitiating factors and the effects vitiating factors may have on contracts. (4 marks)