word limit 1400; and please include the references

Mr. Max Ang engaged Water Plumbing Pte Ltd (\"WP") to supply and install the following items in his master bedroom: (i) A storage heater, (ii) A toilet bowl, (iii) A basin, (iv) A shower set, a bidet spray and bathroom accessories. The total fee was $10,000. Payment was to be made \"net cash as the work proceeds and the balance on completion.\" Mr. Max Ang made two payments totaling $6,000. One month later, WP had completed all the works and requested for payment of the balance of $4,000. Mr. Max Ang complained that WP's work was decient as the heating system did not heat adequately and gave out fumes. WP explained that the cost of rectifying the defect would only cost $1,000. WP was unable to rectify the defect as the company was undergoing restructuring. The company no longer supply and install storage heaters. A new team of workers have been engaged to install solar water heaters and do not have the skill to rectify defects in storage heaters. Nevertheless, Mr. Max Ang paid WP $1,000 and refused to pay the balance sum of $3,000. Mr. Max Ang was unsatisfied with WP's explanation and sought a nonobligation consultation from Leaky Plumbing Pte Ltd (\"LP"). LP investigated the defect and quoted a total fee of $800 to rectify the defect. Advise WP on the following: (a) Explain the 4 ways in which a contract may come to an end. (10 marks) (b) Discuss the LEGAL PRINCIPLES concerning discharge of the contract, APPLY the legal principles, and CONCLUDE on Mr. Max Ang's obligation to pay the balance sum of $3,000. (35 marks) Performance Guide for students. Marks will be awarded for: 0) Content : a. Clear usage, statement and explanation of relevant legal principles b. Original, clear, logical and convincing discussion on application of the laws to the facts (3. Statement of Conclusion d. Appropriate referencing (in-text and list of references) Number and quality of references: At least 5 Organization of answer and writing style (including spelling, grammar, syntax etc). Please make sure you use \"Grammar and Spell check\" functions to check your submissions. Up to 5 marks will be awarded towards (i), (ii) and (iii) (5 marks) (Total marks: 50 marks)