Question

Ravish bought 100 articles for Rs 4000.He sold them at gain of 5%. At what gain percent must he sell the remaining articles so as to gain 20% on the whole?

Answer 1

CP of 1 article = 4000/100 = Rs 40

He sells 20 articles at a gain of 5%

So,

Selling Price Of Those 20 Articles = 40*20 + 40*20*5/100

                                                      =800 + 40

                                                      = Rs 840

On the whole he wants 20% profit  

which means the profit he wants = 20/100   * 4000

                                                    = Rs 800

CP of 80 Articles = 80*40 = Rs 3200

From Rs 800 he already got Profit Of Rs 40 Which Means he has to get More Rs 760

P% = P/CP * 100

     = (760 / 3200) * 100

     = 23.75%