document.write( "Question 1152845: David owns a block of 30-holiday units that he rents out. He estimates that 90% of the units are occupied when he charges $250 rent per unit per night. David finds that if he increases the rent, the demand for the units decreases. For each $40 increase in the charge, three more units are not occupied.\r
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Algebra.Com's Answer #774958 by ikleyn(52794)\"\" \"About 
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document.write( "(a)  Let p be the price for one single unit, and let  d(p)  be the number of occupied units as the function of price.\r\n" );
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document.write( "    The condition says that\r\n" );
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document.write( "        d(250) = 0.9*30 = 27  units,   and\r\n" );
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document.write( "        d(p) = 27 - \"3%2A%28%28p-250%29%2F40%29\".        (1)\r\n" );
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document.write( "    Formula (1) is the answer to question (a).\r\n" );
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document.write( "(b) Total revenue is the product of the number occupied units by the price per unit\r\n" );
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document.write( "       R(p) = d(p)*p = [ 27 - \"3%2A%28%28p-250%29%2F40%29%29\" ]*p.    (2)\r\n" );
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document.write( "    Formula (2) is the answer to question (b).\r\n" );
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document.write( "    You can simplify and transform this formula by any of equivalent ways.\r\n" );
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