29. The Copperfield Mining company operates 2 mines, which produce 3 types of ore: necromancy, legerdemain, and prestidigitation. The company has a contract to supply a smelting company with 120 tonnes of necromancy, 80 tonnes of legerdemain, and 240 tonnes of prestidigitation. Each mine produces a certain amount of each type of ore each hour it is in operation. The company has developed the following table showing how many hours it takes to mine one tonnes of ore at a given mine.

	Mine 1	Mine 2
Cost per hour	$20000	$16000
Number of Hours of to mine one tonne			Contracted Minimum (tonnes)
necromancy	6 hours/tonne	2 hours/tonne	120
legerdemain	2	2	80
prestidigitation	4	12	240