Question 3 (30 marks) Yan Ltd ('Yan') is a giant interior design. Currently, the total indirect cost is allocated to design projects on the basis of direct labor hours. The firm is considering implementation of an activity-based costing ( ABC) system to allocate the total indirect cost. Predetermined allocation rate under the current costing system is $870 per direct labor hour. Yan identified the following indirect cost activitics and cost drivers. The following are data relating to two projects completed by Yan: Required: (a) Compute the total cost of the two projects: Grand Waterfront and (20 marks) Sky Tower, using; (i) The costing system currently adopted by Yan (ii) Activity-based costing (b) Comment on the results. (10 marks)