document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=778530>Question 778530</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The cost of electricity in a certain city is given by the formula A = p + prt for t  and find how long it will take to double his money at the rates of 3%, 7%, and 10% </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #474798 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=474798\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The cost of electricity in a certain city is given by the formula A = p + prt for t and find how long it will take to double his money at the rates of 3%, 7%, and 10%<BR>\n" );
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document.write( "A + P(1+rt)<BR>\n" );
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document.write( "At 3%:: Solve 1+0.03t = 2 <BR>\n" );
document.write( "0.03t = 1<BR>\n" );
document.write( "t = 100/3<BR>\n" );
document.write( "t = 33 1/3 years<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "At 7%:: Solve 1 + 0.07t = 2<BR>\n" );
document.write( "0.07t = 1<BR>\n" );
document.write( "t = 100/7 = 14.29 years<BR>\n" );
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document.write( "At 10%:: Solve 1 + 0.10t = 2<BR>\n" );
document.write( "10%t = 1<BR>\n" );
document.write( "t = 10 years<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============= </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );