document.write( "Question 1197648: In preparing a bid for constructing a new building,a contractor determines that the foundation and basement will cost $605000 and the first floor will cost $360000.Each floor above the first will cost $15000 more than the one below it.How much will the building cost if it is to be 18 floors high?
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Algebra.Com's Answer #831325 by MathTherapy(10552)\"\" \"About 
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In preparing a bid for constructing a new building,a contractor determines that the foundation and basement will cost $605000 and the first floor will cost $360000.Each floor above the first will cost $15000 more than the one below it.How much will the building cost if it is to be 18 floors high?
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To determine the cost of the 1st floor up to the 18th, we use the formula 
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document.write( "for the SUM of an AP: \"matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+%28n%2F2%29%282a%5B1%5D+%2B+%28n+-+1%29d%29%29\"
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document.write( "                     , with n being 18, a1, 360,000, and d, 15,000
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document.write( "                       S18 = 9[720,000 + 17(15,000)]
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document.write( "                           = 9(720,000 + 255,000)
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document.write( "                           = 9(975,000) 
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document.write( "                           = 8,775,000
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document.write( "With cost of the 1st floor up to the 18th being $8,775,000, and cost of foundation and basement, $605,000, 
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document.write( "ENTIRE building then costs: 8,775,000 + $605,000 = $9,380,000
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document.write( "BTW, solution by tutor @EWATRRR is INCORRECT! \n" );
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