document.write( "Question 1163148: If 400 is deposited at a bank at 10% per annum compounded quarterly, how long will it take the deposit to double in value? \n" ); document.write( "
Algebra.Com's Answer #787139 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "\"800=400%281%2B0.10%2F4%29%5E%284t%29\"\r\n" );
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document.write( "\"800%2F400=%281.025%29%5E%284t%29\"\r\n" );
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document.write( "\"2=%281.025%29%5E%284t%29\"\r\n" );
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document.write( "\"ln%282%29=ln%28%281.025%29%5E%284t%29%29\"\r\n" );
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document.write( "\"ln%282%29=4t%2Aln%281.025%29\"\r\n" );
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document.write( "\"ln%282%29%2F4ln%281.025%29=4t%2Aln%281.025%29%2F4ln%281.025%29\"\r\n" );
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document.write( "\"ln%282%29%2F4ln%281.025%29=t\"\r\n" );
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document.write( "\"7.017758631=t\"\r\n" );
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document.write( "Answer: the first quarter it draws interest after 7 years.\r\n" );
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document.write( "Edwin
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