I can assume that the 100 m refers to the length but it is not clear whether the 40 mm is the radius, diameter or, less likely, the circumference. Without that information it is not possible to answer the question.
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Assuming that you are asking does a bathtub hold 350 ml of water: 350 ml of water is not very much water, a typical water bottle that you hold in your hand has more than 350 ml of water in it, so a bathtub big enough to hold a person will hold many times that much.
18 litres
About 10 litres
One hundred million dollars ($100,000,000.00).
about $95.000