Question

A shopkeeper fixes the selling price of his computer to make a profit of 30%. If he reduces his selling price by 10%. What profit will he make

Answer 1

Answer: 17 %

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Step-by-step explanation:

Soln,

Selling price (SP) = x (say)         and Profit percent (P%) = 30

Here, he makes 30% profit

Case I

Cost Price (CP) = 100 *SP /( 100 + P%)

       = 100 * x / 130

       = 10 x /13

Now, Case II

SP = x - 10% of x = 90 % of x = 9x /10

Here CP, remains same = Rs  10x /13

Then,   P = SP -CP = 9x /10 - 10 x/13 = 17x /130

P% = P / CP * 100

     = (17x /130) / (10x /13 ) * 100

   = 17 %