can you help find the lowest cost to deliver all 18 products using this scenario? please explain the math

An appliance manufacturer has two factories located around the world, each with its own capacity: F1 can make 8 appliances per day. F2 can make 10 per day. The factories can deliver to two different distribution centers. Every day each distribution center must receive 9 appliances each. The cost to deliver appliances from each factory to each distribution center is listed in the table below:

	Distribution Center 1	Distribution Center 2
F1	$4	$3
F2	$8	$3