document.write( "Question 137252: A carpenter charges a set fee for each job in additon to his hourly charge. If a carpenter bills a customer $150 for a job which takes him 3 hours and bills a second customer $180 for a 6 hour job, how much would he charge for a job that takes him 9 hours? \n" ); document.write( "

Algebra.Com's Answer #100425 by stanbon(75887) $\"\"$ $\"About$

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A carpenter charges a set fee for each job in additon to his hourly charge. If a carpenter bills a customer $150 for a job which takes him 3 hours and bills a second customer $180 for a 6 hour job, how much would he charge for a job that takes him 9 hours?
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\n" ); document.write( "You have two points relating time and charge: (3,150) and (6,180)
\n" ); document.write( "slope = 30/3 = 10
\n" ); document.write( "150 = 10*3 + b
\n" ); document.write( "b = 120
\n" ); document.write( "EQUATION:
\n" ); document.write( "charge = 10(hrs)+120
\n" ); document.write( "C(9) = 10*9 + 120
\n" ); document.write( "C(9) = $210 (charge for a 9 hour job)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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