Requirements Management Question:
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Why are beer cans tapered at the top and bottom?

Answer:

The metal on the lid of the can is significantly thicker
than the metal on the sides. This means that a great deal
of raw materials can be saved by decreasing the diameter of
the lid, without significantly decreasing the structural
integrity or capacity of the can. This results in savings
of about 15% versus a non-tapered can.

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