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Physics: A cube suspended in water by a cord; find mass and force

A cube of aluminum, whose volume is Va= .125 m^3, and whose density is Da= 2700 kg/m^3 is suspended from a cord which holds it stationary with the top surface horizontal and h= 2.2 m below the surface of fresh water.
See attachment #1 showing known parameters.
PART a. Find the mass of the aluminum.
PART b. Find C, the force in the supporting cord.

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See attachment #2 showing forces.

PART a. The density of a material is mass per volume, so:
(1) Da= Ma/Va
Substitution of knowns will give you:
(2) Ma= 337.5 kg

PART b.
Whenever an object is at rest and ...

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