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To find out how much Ms. Tanaka will earn for selling 12 televisions, we substitute t = 12 into the equation 2,500 + 100t.
2,500 + 100(12) = 2,500 + 1,200 = 3,700
Therefore, Ms. Tanaka will earn $3,700 for selling 12 televisions this month.
None of the provided options match the correct income, so none of the given choices are correct.