document.write( "Question 471094: rental car costs $25 per day plus
\n" ); document.write( "$0.20 per mile. If someone has $200 to spend and
\n" ); document.write( "needs to drive the car 90 miles each day, for how
\n" ); document.write( "many days can that person rent the car? \n" ); document.write( "

Algebra.Com's Answer #323130 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+d+\"$ = number of days the person can rent the car
\n" ); document.write( "The formula to use is:
\n" ); document.write( "(cost of the rental) = (cost per day)x(number of days) + (cost per mile)x(number of miles)
\n" ); document.write( "and
\n" ); document.write( "(number of miles) = (miles per day)x(number of days)
\n" ); document.write( "given:
\n" ); document.write( "Cost per day = $\"25\"$ dollars/day
\n" ); document.write( "Cost per mile = $\"+.02+\"$ dollars/mi
\n" ); document.write( "Miles per day = $\"+90+\"$ mi/day
\n" ); document.write( "The formula must be OK dimensionally, that is
\n" ); document.write( "it must be dollars = dollars
\n" ); document.write( "----------------------------
\n" ); document.write( " $\"+200+=+25%2Ad+%2B+.02%2A90%2Ad+\"$
\n" ); document.write( " $\"+200+=+25d+%2B+1.8d+\"$
\n" ); document.write( " $\"+200+=+d%2A%2825+%2B+1.8%29+\"$
\n" ); document.write( " $\"+26.8d+=+200+\"$
\n" ); document.write( " $\"+d+=+7.463+\"$
\n" ); document.write( "The fraction of a day would not be allowed, so
\n" ); document.write( "the person could rent the car for 7 days
\n" ); document.write( "That means
\n" ); document.write( " $\"+25%2A7+%2B+.02%2A90%2A7+\"$
\n" ); document.write( " $\"+175+%2B+12.6+\"$
\n" ); document.write( " $\"+187.6+\"$
\n" ); document.write( "They would spend $187.60 \n" ); document.write( "

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