The net investment income tax (niit) is computed on

Net investment is computed on several factors which includes capital gains, rental and/or royalty income, income from businesses, interest. To calculate net investment income, an individual's investment  income will be reduced by a certain amount . This is simply to determine the depreciation of the investment.

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explanation:

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the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.