document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=146885>Question 146885</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Problem: To save the environment, the Lion’s Den Cafeteria sells an empty reusable 24-ounce plastic mug to students for $2.99. Using the mug, a student can get a 24-ounce soft drink for a reduced price of 69 cents.\r<BR>\n" );
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document.write( "(1)   If a student buys the mug and uses it only once, then what is the cost for that one drink?\r<BR>\n" );
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document.write( "(2)   If a student buys the mug and uses it twice, then what is the average cost per drink?\r<BR>\n" );
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document.write( "(3)   Does the average cost per drink increase or decrease as the mug is used more and more? \r<BR>\n" );
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document.write( "(4)   If the regular price of a 24-ounce soft drink is 89 cents, then when does the student start saving money?\r<BR>\n" );
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document.write( "(5)   Write a rational expression for which the value of the expression is the average cost per drink and n is the number of times the mug is used.  <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 #107273 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=107273\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. Students buys mug, then drink. $2.99+$0.69=$3.68 (1 drink).<BR>\n" );
document.write( "2. Students buys mug, then drink, then drink. $2.99+$0.69+$0.69=$4.37 for two drinks. $2.19 average (2 drinks).<BR>\n" );
document.write( "3. Decreases, gets closer to $0.69. <BR>\n" );
document.write( "4. In other words, when does the average price go below $0.89.<BR>\n" );
document.write( "Average Cost = (Cost of the mug + N*(Cost of Drink))/N<BR>\n" );
document.write( "Where n is the number of drinks bought.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=%282.99%2B0.69n%29%2Fn ALIGN=MIDDLE  ALT=\"A=%282.99%2B0.69n%29%2Fn\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=2.99%2Fn%2B0.69 ALIGN=MIDDLE  ALT=\"A=2.99%2Fn%2B0.69\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.89=2.99%2Fn%2B0.69 ALIGN=MIDDLE  ALT=\"0.89=2.99%2Fn%2B0.69\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.20=2.99%2Fn ALIGN=MIDDLE  ALT=\"0.20=2.99%2Fn\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n=2.99%2F0.20 ALIGN=MIDDLE  ALT=\"n=2.99%2F0.20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=n=14.95 ALIGN=MIDDLE  ALT=\"n=14.95\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "We move up to the next highest integer, 15.<BR>\n" );
document.write( "After 15 drinks, the student saves money.<BR>\n" );
document.write( "5. We already did that in 4)\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A=2.99%2Fn%2B0.69 ALIGN=MIDDLE  ALT=\"A=2.99%2Fn%2B0.69\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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