A principal increases by 21% over 2 years with compound interest. What will be the simple interest in 4 years at the same interest rate of Rs 1000?

Ram spends 20% of his monthly income on his household needs, 15% of the remaining income on books and 30% of the remaining income on clothes. Now he has Rs 9520 left, so what is his monthly income?

A vertical pole and a vertical tower are standing on the same level ground. Height of the pole is 10 metres. From the top of the pole the angle of elevation of the top of the tower and the angle of depression of the foot of the tower are 60° and 30° respectively. The height of the tower is

of the three numbers, the first is 3 times the second and the third is 5 times the first. If the average of the three numbers is 57, the difference between the largest and the smallest number is: 

Tulika got 95% marks in Physics, Chemistry and Maths together and 225 marks in Computer, English and Hindi. If maximum marks in each subject is 100, what is the total percentage marks obtained by Tulika in all the six subjects together?

A and B can together complete a task 40 days. They worked together for 30 days and then left. A finished the remaining task in next 22 days. In how many days A alone can finish the task?

Cost of 36 pens and 42 Pencils is Rs 460. What is the cost of 18 pens and 21 pencils?