document.write( "Question 1040815: Tom purchased an electric drill for $280 and later sold it for $350. What percentage profit did he make? \n" ); document.write( "
Algebra.Com's Answer #655773 by chen.aavaz(62)\"\" \"About 
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His profit was $350-$280 = $70.
\n" ); document.write( "This means that at an initial value of $280 he made profit $70.
\n" ); document.write( "Since the amounts are proportional, we have\r
\n" ); document.write( "\n" ); document.write( "\"280%2F100+=+70%2Fx\"
\n" ); document.write( "\"280%2Ax=100%2A70\"
\n" ); document.write( "\"x=7000%2F280=25\"\r
\n" ); document.write( "\n" ); document.write( "Therefore he made 25% profit.
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