QUESTION 4 ABike is a company that manufactures folded bikes. It has manufacturing plants at City A, City B, and City C, and Distribution Centers at City 1, City 2 and City 3 to serve the retail outlets in Java and Bali islands. The transportation cost (in Rupiah/unit), annual supply from the manufacturing plants (in units) and annual demand from the distribution centers (in units) are presented in the following table. From City A City B City C Demand City 1 60,000 50,000 80,000 1,350 City 2 70,000 30,000 50,000 1,750 To City 3 40,000 60,000 70,000 1,700 Questions: a. Find the initial solution using the minimum cell cost method! b. Find the optimal solution using the stepping-stone method! Supply 1,000 1,800 2,000