document.write( "Question 789847: A man has ₱ 2,000 invested at 7% and ₱ 5,000 at 4% simple interest. What additional amount must he invest at 6% to give him an overall of 5%? \n" ); document.write( "
Algebra.Com's Answer #478956 by Edwin McCravy(20054)\"\" \"About 
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A man has ₱ 2,000 invested at 7% and ₱ 5,000 at 4% simple interest. What additional amount must he invest at 6% to give him an overall of 5%?
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document.write( "Answer = ₱ x \r\n" );
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document.write( "Investments     | Rate |   Interest\r\n" );
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document.write( "  ₱ 2,000       | .07  | ₱ .07(2000)\r\n" );
document.write( "  ₱ 5,000       | .04  | ₱ .04(5000)\r\n" );
document.write( "  ₱ x           | .06  | ₱ .06(x)\r\n" );
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document.write( "₱(2000+5000+x)  | .05  | ₱ .05(2000+5000+x)\r\n" );
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document.write( "₱ .07(2000) + ₱ .04(5000) + ₱ .06(x) = ₱ .05(2000+5000+x)\r\n" );
document.write( "      .07(2000) + .04(5000) + .06(x) = .05(2000+5000+x)\r\n" );
document.write( "                    140 + 200 + .06x = .05(7000+x)\r\n" );
document.write( "                          340 + .06x = 350 + .05x\r\n" );
document.write( "                                .01x = 10\r\n" );
document.write( "                                   x = \"10%2F.01\"\r\n" );
document.write( "                                   x = 1000\r\n" );
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document.write( "Answer: ₱ 1,000\r\n" );
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document.write( "Edwin

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