If on selling 12 notebooks, a seller makes a profit equal to the selling price of 4 notebooks,what is his percent profit ?

Using the direct formula for profit percentage when profit equals the selling price of $x$ items out of $n$ items sold, the profit percentage is ($x$ divided by ($n$ minus $x$)) multiplied by 100. Substituting $n=12$ and $x=4$, we get (4 divided by (12 minus 4)) multiplied by 100. This simplifies to (4 divided by 8) multiplied by 100, resulting in a 50 percent profit.

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