By Selling 90 pens for Rs. 80 a man loses 20%. What should be the selling price (in Rs.) of 90 pens for 20% profit?

Vinayak bought an item and sold it at a loss of 5%. If he had bought it for 10% less and sold it for Rs.390 more, he would have had a profit of 20%, find the cost price of item.

A shopkeeper bought goods for Rs. 2025. He sold $$ {1\over 5}$$ th of it at 20% profit and the remaining at the profit of 5%, the profit per cent on the whole is

A person bought some articles at the rate of 5 per rupee and the same number at the rate of 4 per rupee. He mixed both the types and sold at the rate of 9 for 2 rupees. In this business he suffered a loss of Rs. 3. The total number of articles bought by him was 

The cost price of item B is Rs. 150/- more than the cost price of item A. Item A was sold at a profit of 10% and item B was sold at a loss of 20%. If the respective ratio of selling prices of items A and B is 11 : 12, what is the cost price of item B?

What is the discount rate of a gift whose selling price is Rs. 420 after a reduction of Rs. 60 on its marked price ?

Arun purchased 30 kg. of rice at the rate of Rs. 17.50 per kg. and another Rs. 30 kg. at a certain rate. He mixed the two and sold the entire quantity at the rate Rs. 18.60 per kg. and made 20% overall profit. At what price per kg. did he pruchase the lot of another 30 kg. rice?

The price of 6 pencils is Rs. 30 and that of 12 pens is Rs. 120. What is the average price of 50 pencils and 50 pens?