document.write( "Question 272935: what is the interest rate if I invest $20,000 at the baby's birth in order to have $100,000 in 18 years \n" ); document.write( "

Algebra.Com's Answer #199502 by checkley77(12844) $\"\"$ $\"About$

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20,000(1+x)^18=100,000
\n" ); document.write( "(1+x)18=100,000/20,000
\n" ); document.write( "(1+x)^18=5 take the 18th. root of both sides.
\n" ); document.write( "1+x=1.09353
\n" ); document.write( "x=1.09353-1
\n" ); document.write( "x=.09353 is the required interest rate.\r
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