document.write( "Question 376720: Determine the principal P that must be invested at rate r, compounded monthly, so that $500,000 with be available for retirement in t years:\r
\n" ); document.write( "\n" ); document.write( "r=12%, t=40
\n" ); document.write( "

Algebra.Com's Answer #267967 by rfer(16322)\"\" \"About 
You can put this solution on YOUR website!
500000=P(1+0.12/12)^40*480
\n" ); document.write( "P=500000/(1.01)^480
\n" ); document.write( "P=500000/118.648
\n" ); document.write( "P=4214.15
\n" ); document.write( "
\n" );