I have bought a dozen of exercise books from the Banerjee book stall of our locality for Rs. 90 only. Let’s calculate the price of such 18 exercise book by the Rules of three.

If the price of one exercise book is Rs. 6.50, Let's find the price of 15 such exercise books.

The cost of my school exercise book was Rs. 10. Now 1 buy the same exercise book for Rs. 12. Let's calculate the percentage increase in the price of the exercise book.

Mili bought few exercise books for ₨. 80.50. Her brother bought few more for ₨. 57.50. Lets find the maximum price of an exercise book and total number of exercise books bought.

Sunit bought 2 exercise books for Rs. 14. Let's find how much he will pay for 7 such exercise books.

I bought 2 exercise books. Cost of each exercise book is x rupees. My friend Imtiyaz bought 6 exercise books. But cost of each exercise book of Imtiyaz is 5 more than my exercise book. Calculate, how much money did I spent on exercise books and how much did Imtiyaz spent on his exercise books.

Mithu wants to buy 4 exercise books. If exercise book costs Rs. 12.75, let’s find how much money Mithu will need.

Trisha has bought a book from the book stall of Milan dada. Milandada gave her discounts of 10% and 5% respectively. Let’s work out how much Trisha paid to Milandada if the M.R.P. of the book was Rs. 200.

The length and breadth of a page of my exercise book is 15 cm. and 12 cm. respectivley. A margin of width 2 cm. is drawn on all sides and wrote inside the margin. Let's also draw a rough sketch for the problem. Let's find the area of the portion on which I wrote. Let's also find the area of the portion on which I have not written.

In a certain year, Vivekanda Youth Library received a Govt. grant of Rs. 74,350 and collected a subscription or Rs. 4,350. Also, they got Rs. 1300 by selling old papers etc. If the entire money is spent on buying new books, for binding of old books and paying salary to employees in the ratio of 15 : 3 : 2 . Now let's calculate for how much new book were bought.

I have Rs. 150. With 0.3 part of my money I bought exercise books and with 0.4 part I bought a story book. Let me find, what amount of money is left with me.