document.write( "Question 528278: I have a 90% in my class, what will I need on the final exam worth 20% of my grade to get an 86% overall? \n" ); document.write( "

Algebra.Com's Answer #349210 by Edwin McCravy(20056) $\"\"$ $\"About$

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I have a 90% in my class, what will I need on the final exam worth 20% of my grade to get an 86% overall?
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document.write( "The 90% counts 80% and the final exam counts 20%.\r\n" );
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document.write( "Let x = your grade on the final exam. Then\r\n" );
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document.write( "80% of 90% + 20% of x = 86%\r\n" );
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document.write( "    (.80)(.90) + .20x = .86 \r\n" );
document.write( "           .72 + .20x = .86\r\n" );
document.write( "                 .20x = .14\r\n" );
document.write( "                    x = .70\r\n" );
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document.write( "So a 70% on your final exam will bring your 90% down to an 86%.\r\n" );
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document.write( "Edwin

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