document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=119880>Question 119880</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I've been trying to work this problem, but I'm stumped.  I have been trying it with the variable rate equations A=RB and variable rate + fixed rate = total rate.  Here is the problem:  A 60watt bulb cost 50 cents to buy and 12 cents per day to use (24hrs).  Another bulb cost $2.50 to buy and 2 cents per day to use.  How many days of use will it take for the cost of the bulbs to be equal and what is the equivalent cost? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #87850 by </B><A HREF=/tutors/aboutme.mpl?userid=NinangS><B>NinangS(5)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=NinangS><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=87850\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x represent the number of days.<BR>\n" );
document.write( "The cost of the first bulb would be <BR>\n" );
document.write( "0.50+0.12x <BR>\n" );
document.write( "and the second would be <BR>\n" );
document.write( "2.50+0.02<BR>\n" );
document.write( "Since they need to be equal set up would look like this<BR>\n" );
document.write( "0.50+0.12x = 2.50+0.02x<BR>\n" );
document.write( "now solve for x<BR>\n" );
document.write( "0.50+0.12x = 2.50+0.02x<BR>\n" );
document.write( "0.12x-0.02x = 2.50-0.50<BR>\n" );
document.write( "0.10x = 2.00<BR>\n" );
document.write( "x = 20 days<BR>\n" );
document.write( "Now to find the amount replace x with 20<BR>\n" );
document.write( "0.50+0.12(20) = 2.50+0.02(20)<BR>\n" );
document.write( "$2.90 = $2.90<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );