Treat each of the following cases as independent of the others. Tax savings should be preceded by a $"-"$ sign. Round the answers to the nearest cent.

a$.$ She sold stock for $$4,095$ that she purchased for $$3,5002$ months earlier.

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b$.$ She sold bonds for $$4,300$ that she purchased for $$3,0002$ years earlier:

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c$.$ She sold stock for $$2,050$ that she purchased for $$2,50023$ months earlier. Assume this to be the only Stock in Isabella's portfolio.

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