document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1023777>Question 1023777</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sign says that the price marked on all music equipment is 30%off the original price ,you buy an electric guitar for the sale price of $315 , what was the original price?<BR>\n" );
document.write( "How to solve this or what formula should I use </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #639341 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=639341\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the basic formulas involved are:\r<BR>\n" );
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document.write( "sale price = original price minus discount.<BR>\n" );
document.write( "discount = original price * discount percent / 100.\r<BR>\n" );
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document.write( "let s represent the sale price.<BR>\n" );
document.write( "let p represent the original price.<BR>\n" );
document.write( "let d represent the discount.<BR>\n" );
document.write( "let k represent the discount percent.\r<BR>\n" );
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document.write( "the above formulas become:\r<BR>\n" );
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document.write( "s = p - d<BR>\n" );
document.write( "d = p * k/100\r<BR>\n" );
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document.write( "we know that s = 315.<BR>\n" );
document.write( "we know that k = 30.\r<BR>\n" );
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document.write( "formulas become:\r<BR>\n" );
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document.write( "315 = p - d<BR>\n" );
document.write( "d = p * 30/100\r<BR>\n" );
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document.write( "simplify these formulas to get:\r<BR>\n" );
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document.write( "315 = p - d<BR>\n" );
document.write( "d = .3p\r<BR>\n" );
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document.write( "since d = .3p, then the first formula can be shown as:\r<BR>\n" );
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document.write( "315 = p - .3p, after we replace d with its equivalent value of .3p.\r<BR>\n" );
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document.write( "simplify to get 315 = .7p.\r<BR>\n" );
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document.write( "divide both sides of this equation by .7 to get:\r<BR>\n" );
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document.write( "315/.7 = p\r<BR>\n" );
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document.write( "solve for p to get p = 450.\r<BR>\n" );
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document.write( "the original price is 450.\r<BR>\n" );
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document.write( "30% of 450 = 135.\r<BR>\n" );
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document.write( "450 - 135 = 315, which is the sale price.\r<BR>\n" );
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document.write( "numbers look good.\r<BR>\n" );
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document.write( "solution is that the original price is 450.\r<BR>\n" );
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document.write( "it doesn't really matter what variable names you choose as long as you can keep track as to what variable name represents what.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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