Data Interpretation - Pie Charts - Discussion

Firstly, Read the question thoroughly. The question says that "The price of the book is marked 20% above CP(Cost Price) and the Marked price of the book is Rs 180. Marked Price is nothing but Sp(Selling price). These are the assumptions we can make from the question.

Soln: We need to find the CP now from the data given above.
Lets take the CP as 'x'. As the price of the book is marked(SP) 20% above the CP, the equation becomes:
x+20/100(x)=180
=> x=150
So, CP= Rs 150

Now, we need to find the cost of paper used in a single copy of the book.. i.e
25/100(150)=37.5

@All.

The question says that "The price of the book is marked 20% above CP(Cost Price) and the Marked price of the book is Rs 180. Marked Price is nothing but Sp(Selling price). These are the assumptions we can make from the question.

Soln: We need to find the CP now from the data given above.

Lets take the CP as 'x'. As the price of the book is marked(SP) 20% above the CP, the equation becomes:
x+20/100(x) = 180.
=> x = 150,
So, CP= Rs 150.

Now, we need to find the cost of paper used in a single copy of the book.. i.e;
25/100(150) = 37.5.

As mention 20% above means 20% extra therefore total % is counted as 100 and 20% extra means 100+20 =120%.

Let the cost price be x.

And as mentioned in the question 20% above CP therefore.

x + 20% x = 180.

As 150 is the marked price and we are finding cost price therefore we are writing equal to 180.

Hence we get x = 150.

Now this is the CP = 150.

Paper cost 25% of CP as given in the question itself.

Total cost was 150.

Paper cost = 25/100 = 0.25*150 = 37.5.

@ The question is only asking for the paper cost of a book and not all sorts of binding, promotion and other costs.

That is why we use this basic percentage method,
25% of the total cost is the paper cost of a book.
So, 25/100 *150 (why the total cost is being taken as 150, you yourself think carefully about it)
= 37.5 Rs.

Let us take CP as = 100%.
Marked price in percentage 20%.
Marked price = 180.

So,
CP + MP = 120%.

Now;
Paper Cost is in percentage = 25%.
Let's cross-multiply this;
120%= 180.
25% = x.
120% (x) = 25%(180).
(both side percentages getting cancelled)
120 * x = 25 * 180
x = 25 * 180/ 120
x = 3/2 * 25.
x = 37.5.

Let CP = 100%
Marked price = 20% + 100(c.p) = 120
Given,cost of paper=25%,
Marked price = RS 180,
Let's" x" be price of cost paper,
Therefore,cost of paper:marked price,
25% : 120%,
X : 180.

By Crossmultiplying.
We get,25 * 180=120x.
X = 4500/120,
X = 37.5.

I also face the same problem but after reading carefully I understood that.

1) Marked 20% above the C.P.

2) Marked price (SP) of the book is Rs. 180.

Now SP = 120% of C.P. That not 20% of 180 but 120% of C.P = 180.

25% of C.P = X.

So by taking ratio 37.5.

Given data,
Sp=180
Mp(or) sp = 120% of cp

Then;
180=(120/100)*cp.
Therefore, Cp = 150,
From pie chart paper cost = 25% of Cp.
= (25/100)*150.
= 37.5.

If the selling price of the book is 120%.
Because cp=100% and profit = 20%.
Again, 120%= 180 rs. (Acc. To ques).
Then, 1%= 3/2.

Now, we know that the cost of printing is 25%,
So, the cost of printing in this case is,
25x3/2= 37.5.

Here 1st we need to find the cost price to find printing cost,
It is printing cost = (25*cp)/100.

We have formula for finding cp = (100*sp)/(100+gain%)
=(100*180)/(120)
=150

Therefore printing cost=(25*150)/100
=37.5