## 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.