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An author received Taka 0.80 in royalties for each of the first 100,000 copies of his book sold, and Taka 0.60 in royalties for each additional copy sold. If he received a total of Taka 260,000 in royalties, how many copies of his book were sold?

Correct Answer: 400,000
Let the number of copies sold be X. Then,  100000×0.8 + (X - 100000)×0.6 = 260000 or,  80000 + 0.6X - 60000 = 260000 or,  0.6X = 260000 - 80000 + 60000 or,  0.6X = 240000 or,  X = 240000/0.6 = 400000 copies

At a photocopy center , the first 10 copies cost x taka each. Each of the next 50 copies costs 2 taka less per copy . From the 61 st copy on, the cost 1 Taka per copy, In terms of x how much does it cost in. Taka to have 200 copies made/

It costs Tk. 1000 to make the first thousand copies of a book and x taka to make each additional copies. If a total of 6000 copies were made with a total cost of Tk. 5500, what is X?

It costs X taka each to make the first thousand copies of a CD and Y taka to make each subsequent copy. How many taka will it cost to make Z copies (Z is greater than 1000) of the CD?

One copy machine can make 20 copies a minute, and a second copy machine makes 15 copies a minute. If the two copies work together, how long would it take them to make 2100 copies?

It costs TK. 1,000 to make the first thousand copies of a book and X taka to make each subsequent copy. If it costs a total of TK. 7,230 to make the first 8,000 copies of a book, what is the value of X?

In a cricket tournament 30,000 tickets were sold. One-fourth of the tickets were sold at TK. 30 each, 1/3 were sold at TK. 25 each, and the remaining tickets were sold at TK. 20 each. How many tickets were sold at TK. 20 each ?

The cost of setting up a magazine is Rs. 2800. The cost of paper and ink etc is Rs. 80 per 100 copies and printing cost is Rs. 160 per 100 copies. In last month 2000 copies were printed but only 1500 copies could be sold at Rs. 5 each. Total 25% profit on the sale price was realized. There is one more resource of income from magazine which is advertising. What sum of money obtained from the advertising in magazine?

The cost of setting up the type of a magazine is Rs. 1000. The cost of running the printing machine is Rs. 120 per 100 copies. The cost of paper, ink and so on is 60 paise per copy. The magazines are sold at Rs. 2.75 each. 900 copies are printed, but only 784 copies are sold. What is the sum to be obtained from advertisements to give profit of 10% on the cost?

Under Section 63 of the Indian Evidence Act, secondary evidence includes:
1. Certified copies
2. Copies made from the original by mechanical processes, and copies compared with such copies
3. Copies made from or compared with the original
4. Counterparts of documents, as against the parties who did not execute them
5. Oral accounts of the contents of a document by a person who has seen it

Ten books are arranged in a row following a certain sequence. Among them 3 are History , 3 are Economics, 2 are Maths and 2 are English. From the left, there is an English book between a History and Maths book, a history book between a Maths and an English book, an Economics book between an English and a Maths Book. a Maths book between two Economics books and two Economics two Economics book between a Maths and a History book. Book of which subject is at the sixth position from the left?