Question

The cost price of 15 dozen notebooks is equal to the selling price of 12 notebooks .find the gain percent?

Answer 1

Answer:
           Let the Cost Price of one Dozen notebooks be Rs 1
     Therefore , Cost Price of 15 dozen notebooks = Rs 15
      and Selling Price of 12 notebooks = Cost Price of 15 Dozen Notebooks
                                                        =15
     Gain = Selling Price 15 Dozen Notebooks - Cost Price of 15 dozen notebooks 
             = 15*15 - 15*1=225 - 15 = 210 (Because selling Price of 12 notebooks = 15)
      Gain % = Gain /cost Price *100
                  = 210/15*100
                 Gain % =1400%
hope this helps You!!

Enjoy !!
Cheers !!!
  

Answer 2

Let the Cp of 15X12 notebooks be x
so the Cp of each notebook=x/180

the Sp of 12 notebooks =x
SO the sp of each notebook=x/12

[tex]GAin=[tex] \frac{x}{12} - \frac{x}{180} = \frac{168x}{180X12} Profit %=(gain/Cp)X100= (\frac{168x}{180X12} X 180/x)X100=1400%