Question 4 a Describe and discuss the different ways in which a contract may be discharged or ended. Illustrate your answer by reference to relevant legal principles and cases. Do not refer to relevant legislation. [i2 marks] Itzbiz Pt}; Ltd entered into a contract with the Tasmanian Government to excavate an underground railway tunnel within 2 years of the signing of the contract. To achieve this result both parties were aware that Itzbiz would need to work 24 hours a day, seven days a week. However the noise and vibrations caused by the excavation were so great that the local residents obtained an interim injunction restricting the amount of noise at night and reducing the working week to six days. This caused Itzbiz additional costs and therefore a loss of prot. Required Did the granting of the injunction frustrate the contract, entitling Itzbiz to recover on a quantum merm't for the work done rather than the originally agreed price? [ i 3 marks]