Can anyone help?

A sports apparel company has received an order for a college basketball team's national championship T-shirt. The company can purchase the T-shirts from textile factories in China, Cambodia, and Japan. The shirts are shipped from the factories to companies in the Philippines that silk-screen the shirts before they are shipped to distribution centers. Following are the production and transportation costs (P/shirt) from the T-shirt factories to the silk-screen companies to the distribution centers, plus the supply of T-shirts at the factories and demand for the shirts at the distribution centers: Silk-Screen Company T-shirt Factory Quezon City Makati City Manila City Supply (1,000s) China P40 P60 P30 18 Cambodia 30 50 50 15 Japan 20 40 40 23 Distribution Center Silk-Screen Company Luzon Visayas Mindanao Quezon City P50 P70 P90 Makati Coty 70 60 100 Manila City 80 60 80 Demand (1,000s) 20 12 20 Determine the optimal shipments to minimize total production and transportation costs for the apparel company