If Manoj buys 324 toffees for Rs 486, then how many toffees should he sell for Rs 90 to make 50% profit?

A radio is sold for Rs.900 at 10% profit. If it had been sold for Rs 890, what would have been the actual profit or loss?

By selling an article for Rs. 600 there is a profit of 20%. What is the cost price of the article?

If the loss is 20%, by what fraction should the selling price be multiplied to get the cost price?

There is a loss of 5% by selling an article for Rs.665. In order to get 12% profit on that article, its selling price has to be kept?

The cost of a new scooter is Rs 25000, at the end of each year its value becomes 80% of the starting price of that year, what will be the cost of the scooter after 3 years?

A shopkeeper charges his customers 15% above the cost price, if a customer has bought a sofa-set for 9039, then for how much did the shopkeeper buy it?

Total cost of A pens and (A-2) pencils is Rs 424. If one pencil and one pen costs Rs 4 and Rs 20 respectively then find A?