Average, profit and loss, simple and compound interest

Latika offers a discount of 20% on all the items at her shop and still makes a profit of 12%. Cost price of an article marked at Rs. 280 is

If the selling price of a cooler is ₹ 11,200 and profit is 12 percent, then the purchase price of the cooler is

The rate percent per annum compound interest, where ₹ 5,000 amounts to ₹ 5,832 in two years, will be

Rohit bought an old scooter for ₹ 11,500 and spent ₹ 1,000 on its repairing. He sold it for ₹ 15,000. Then

A certain amount becomes two times with simple interest in a certain time (T years) at a certain rate of interest (R%) per annum. Then which of the following is not correct about rate and time?

Arun bought 4 shirts. Out of these, he sold two shirts at a profit of 10% and one shirt at a loss of 7.5%. If all the shirts have been sold and he earned a profit of 6% in this business, then Arun sold the fourth shirt at ________.

A Teak tree increases annually by 1/6 of its height. By how much will it increase after 2 1/4 years, if it stand today 18 feet high ?

A shopkeeper sold two mobiles in Rs 2400 each. In this sell he gets 20% profit on one but 20% loss on second mobile. What is his net profit or net loss?