document.write( "Question 874185: If I have an 80% in a class, what is the lowest score I can get on the final that is worth 30% of our grade to keep at least an 80%? \n" ); document.write( "

Algebra.Com's Answer #527369 by jim_thompson5910(35256) $\"\"$ $\"About$

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(weight of other classwork)*(score on other classwork) + (weight of final)*(score on final) = (Final Grade)\r
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\n" ); document.write( "\n" ); document.write( "(0.70)*(0.80) + (0.30)*(x) = (0.80)\r
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\n" ); document.write( "\n" ); document.write( "0.56 + 0.30x = 0.80\r
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\n" ); document.write( "\n" ); document.write( "0.30x = 0.80 - 0.56\r
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\n" ); document.write( "\n" ); document.write( "0.30x = 0.24\r
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\n" ); document.write( "\n" ); document.write( "x = 0.24/0.30\r
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\n" ); document.write( "\n" ); document.write( "x = 24/30\r
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\n" ); document.write( "\n" ); document.write( "x = 4/5\r
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\n" ); document.write( "\n" ); document.write( "x = 0.8\r
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\n" ); document.write( "\n" ); document.write( "So you need to get at least an 80% on the final to get an overall grade of 80% or higher. This is assuming the grade isn't curved or anything. \n" ); document.write( "

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