Orders and costs

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Problem Statement

A restaurant has incoming orders for which you need to compute the costs based on the menu.

You might get multiple orders at times.

Examples:
if the order is {:rice => 1, :noodles => 1}, and the menu is {:rice => 3, :noodles => 2}, then the cost is 5.

If the orders are {:rice => 1, :noodles => 1} and {:rice => 2, :noodles => 2} and the menu is {:rice => 3, :noodles => 2}, then the cost is 15.

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