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If a 3.9 lb ball of aluminum is coated with a 644 micrometer layer of gold, what is the density (in g/mL) of the gold-coated aluminum ball? The densities of aluminum and gold are 2.70 g/mL and 19.32 g/mL, respectively. Type your numerical answer to 2 decimal places (ex N.NN) without units.

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