A sum of Rs. 2000 at 40% per annum compounded annually. Calculate the interest for the third year at compound interest.

A cow was sold at 8% profit. If it were bought at 20% less and sold at 40% profit, then the owner would gain ₹ 640 more. Find the initial cost price of the cow.

A wire of length 60 m is used to enclose a field which is in the shape of a right - angled triangle. The area of the field is 150 m² then, the largest side of the field has a length of: 

The cost price of a radio is Rs. 600. The 5% of the cost price is charged towards transportation. After adding that, If net profit to be made is 15%, then the selling price of the radio must be 

A 240 meter long train crosses a 300 meter long platform in 27 seconds. What is the speed of the train in Kmph?

The smallest possible three - place decimal is: 

The side of a square is 8 cm. If a square is made by joining the mid points of each sides of this square and this process goes up to infinity. Calculate the sum of areas of all the squares made.

Simple interest on a certain sum is equal to the sum itself. find the time if rate of interest and time are numerically equal.