document.write( "Question 441706: Find the time required for an investment of $5000 to grow to $8000 at an interest rate of 8.5% per year, compounded quarterly. \n" ); document.write( "
Algebra.Com's Answer #304801 by robertb(5830)\"\" \"About 
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\"8000+=+5000%281+%2B+0.085%2F4%29%5E%284t%29\"\r
\n" ); document.write( "\n" ); document.write( "\"8%2F5+=+1.02125%5E%284t%29\"\r
\n" ); document.write( "\n" ); document.write( "\"ln%281.6%29+=+4t%2Aln%281.02125%29\"\r
\n" ); document.write( "\n" ); document.write( "\"t+=+ln%281.6%29%2F%284ln%281.02125%29%29+=+5.6\" years.
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