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2015-11-08T13:29:05+05:30

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Let the cost price be CP
Sale price SP = CP + profit

   Given that  profit = CP * 12/100

if profit becomes  CP * 12/100 +  288  then the  profit percentage is now
       [12 CP /100 + 288 ] / CP  * 100  = 18
       12 CP/100  + 288 = 18 * CP/100
        6 CP/100 = 288
        CP = 4, 800 units
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simpler method:

   The difference between 12%  and 18% profit is  288..
         So  6% profit = 288
                   CP * 6/100 = 288
                     CP = 4, 800

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click on thanks button above;;; select best answer
I love this 2nd method more the simpler method more the sum becomes clear thanks so much