document.write( "Question 1193508: Armando is selling rulers.he bought rulers for 0.20c each,and sold them (except foe broken ones) at N$1.10 each to make a profit of N$306.50. The number of broken rulers is 38. How many rulers did he buy? \n" ); document.write( "

Algebra.Com's Answer #825542 by ikleyn(52803) $\"\"$ $\"About$

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\n" ); document.write( "Armando is selling rulers. he bought rulers for 0.20c each, and sold them (except foe broken ones)
\n" ); document.write( "at N$1.10 each to make a profit of N$306.50. The number of broken rulers is 38. How many rulers did he buy?
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document.write( "Let n be the number of rules he bought.\r\n" );
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document.write( "Then the number of rules he sold was (n-38).\r\n" );
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document.write( "He spent 0.2*n  dollars to buy n rules.\r\n" );
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document.write( "He collected 1.10*(n-38) dollars by selling the rules.\r\n" );
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document.write( "His profit is the difference\r\n" );
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document.write( "    1.10(n-38) - 0.2n   dollars.\r\n" );
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document.write( "The profit equation is\r\n" );
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document.write( "    1.10(n-38) - 0.2n = 306.50   dollars.\r\n" );
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document.write( "Simplify and find n\r\n" );
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document.write( "    1.10n - 1.1*38 - 0.2n = 306.50\r\n" );
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document.write( "            0.9n          = 306.50 + 1.1*38\r\n" );
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document.write( "            0.9n          =      348.3\r\n" );
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document.write( "               n          =      348.3/0.9 = 387.\r\n" );
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document.write( "ANSWER.  Armando bought 387 rulers.\r\n" );
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