Waterloo company manufactures four joint products which have a manufacturing cost of $120,000 at the split-off point. Data pertaining to these products are as follows: Product A B C D Total Final market value per | Processing cost after Units produced and unit split-off sold $.50 $2,000 20,000 5.00 10,000 15,000 4.50 10,000 10,000 8.00 28,000 15,000 60,000 Required: a) Allocate the joint costs under each of the following methods: 1. Final Sales value method (3 marks) 2. Estimated Net Realizable Value method (NRV); and (4 marks) 3. Constant gross margin percentage NRV method. (8 marks) b) Why are joint costs irrelevant in the "sell or process further" decision? (3 marks)