document.write( "Question 149172: Walt made an extra 9000 last year from a part time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770.00 in interest. How much was invested at 8%? \n" ); document.write( "
Algebra.Com's Answer #109478 by ankor@dixie-net.com(22740)\"\" \"About 
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Walt made an extra 9000 last year from a part time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770.00 in interest. How much was invested at 8%?
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\n" ); document.write( "Let x = amt invested at 8%
\n" ); document.write( "The total was given as $9000, therefore:
\n" ); document.write( "(9000-x) = amt invested at 9%
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\n" ); document.write( "Write an interest equation:
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\n" ); document.write( "interest at 8% + interest at 9% = $770
\n" ); document.write( ".08x + .09(9000-x) = 770
\n" ); document.write( "Multiply what's inside the brackets
\n" ); document.write( ".08x + 810 - .09x = 770
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\n" ); document.write( ".08x - .09x = 770 - 810
\n" ); document.write( ":
\n" ); document.write( "-.01x = -40
\n" ); document.write( "x = \"%28-40%29%2F%28-.01%29\"
\n" ); document.write( "x = $4000 invested at 8%
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\n" ); document.write( "Check solution ($5000 invested at 9%)
\n" ); document.write( ".08(4000) + .09(5000) =
\n" ); document.write( " 320 + 450 = 770; confirms our solution \n" ); document.write( "
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