Mallory Corporation has a calendar year-end. The corporation has paid estimated payments of $10,000 during 2012 but still owes an additional $5,000 for its 2012 tax year.

a. When is the 2012 tax return due?

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b. If an automatic extension of time to file is requested, when is the 2012 tax return due?

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c. If an extension of time to file is requested, when is the additional $5,000 of tax for 2012 due?

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