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In the box, the price of 50 books is 75% of the price of 120 notebooks. The price of a pen is Rs.20. The price of a pen is 40% of price of a notebook. If 10 same pens are added into the box, then what is difference in the price of book and the price of the notebook?

In the box, the price of 50 books is 75% of the price of 120 notebooks. The price of a pen is Rs.20. The price of a pen is 40% of price of a notebook. If 10 same pens are added into the box, then what is difference in the price of book and the price of the notebook? Correct Answer Rs. 40

GIVEN :

The price of 50 books is 75% of the price of 120 notebooks.

The price of a pen is Rs.20.

The price of a pen is 40% of price of a notebook. If 10 same pens are added into the box.

ASSUMPTION :

Let price of a book and a notebook be Rs. a and Rs. b respectively.

CALCULATION :

Price of notebook = 20 × 100/40 = 50

Price of 120 notebooks = 50 × 120

Given,

Price of 50 books = (50 × 120) × 75/100 = 4500

Price of a book = 4500/50 = 90

∴ Required Difference = 90 – 50 = Rs. 40

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