document.write( "Question 129391This question is from textbook A Survey of Mathematics with Applications
\n" ); document.write( ": Mike invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate? \n" ); document.write( "
Algebra.Com's Answer #94530 by amine(11)\"\" \"About 
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we suppose that X is the value invisted by 9%\r
\n" ); document.write( "\n" ); document.write( "then 9%X+11%(6000-X)=624 => 9X-11X+66000=62400 => X=1800 the value invested at 9% and Y=6000-1800=4200 is the value invested at 11%
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