document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=340304>Question 340304</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Henry Ford’s Model T was originally designed and built to be run on ethanol.  Today ethanol (190-proof) can be produced with domestic stills for about $0.75 per gallon.  When blended with gasoline costing $3.00 per gallon, a 20% ethanol and 80% gasoline mixture costs $2.55 per gallon.  Assume fuel consumption at 25 miles per gallon and engine performance in general are not adversely affected with this 20-80 blend (Called E20).  \r<BR>\n" );
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document.write( "a.	How much money can be saved for 15,000 miles of driving per year?<BR>\n" );
document.write( "b.	How much gasoline per year is being conserved if one million people use the E20 fuel?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #243819 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=243819\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> ethanol cost .75 per gallon.<BR>\n" );
document.write( "gasoline cost 3.00 per gallon.<BR>\n" );
document.write( "a 20/80 mixture of ethanol/gasoline costs .2*.75 + .8*3 = 2.55 per gallon.<BR>\n" );
document.write( "fuel consumption is 25 miles per gallon.<BR>\n" );
document.write( "miles driven per year is 15,000<BR>\n" );
document.write( "for each person, the savings in gasoline would be .2 * 15000 / 25 gallons per year.<BR>\n" );
document.write( "that equates to 120 gallons per year.<BR>\n" );
document.write( "for 1 million people, the savings in gasoline would be 120 million gallons per year.<BR>\n" );
document.write( "look at it another way:<BR>\n" );
document.write( "15000 miles per year / 25 = 600 gallons of gasoline per year.<BR>\n" );
document.write( "if only 80% of that was pure gasoline and 20% of that was ethanol, then the number of gallons of gasoline consumed is .8 * 600 = 480.<BR>\n" );
document.write( "subtract 480 from 600 and you get 120 gallons of gasoline that is saved per year per person.<BR>\n" );
document.write( "multiply that by 1 million and you get 120 million gallons of gasoline saved per year.<BR>\n" );
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