Amit lends a sum of money at 20% per annum compounded annually. If he charges the interest semi-annually he will receive Rs 400 more in one year than charged annually. Find the sum lead by Amit. 

In a bag, there are three types of coins 1 rupee, 50 paisa and 25 paisa in the ratio 3:8:20. The total value in bag is Rs372. Find the total number of coins in the bag.

There is a 50% increase in an amount in 5 years at simple interest. Find the compound interest at Rs. 10,000 after 2 years at the same rate.

A certain number is added to each of the two numbers which are in the ratio 4:7. The sum of the numbers thus obtained is 75 and their ratio (taken in the same order as mentioned above) becomes 8:17. What is the number added?

A sum of ₹ 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of ₹ 362.50 more is lent but at the rate twice the former. At the end of the year, ₹ 33.50 is earned as interest from both the loans. What was the original rate of interest?

If the difference between CI and S.I on a certain sum of money for 3 years at 5% per annum is Rs. 122 find the sum. 

Mr Rajveer purchased a unique diamond called "Zoinoor", which was very expensive and the cost of the diamond is proportional to square of its weight. But he accidently broke the diamond and it was split into three pieces which were in ratio of 3:2:1 by weight. If he incurred a total loss of Rs 46200 due to the accident, find the initial cost of diamond.

Rahul lent a sum of Rs. 8000 at 6% p.a. to Rajat and Rs. 9600 at 7% p.a. to Ravi. In what time would the total interest be Rs. 2880?

If $\frac{x}{4}=\frac{y}{10}=\frac{3}{18}$, then $\frac{x+y+z}{2x}$ is equal to

The perimeter of a quadrilateral is 243 cm. If the sides of the quadrilateral are in ratio $\frac{2}{3}:\frac{5}{6}:\frac{7}{10}:\frac{1}{2}$.Find the difference of the sum of two smaller sides to that of the two larger sides.

Some chocolates were distributed among three friends in such a manner that Rajesh received $\frac{2}{3}r\mathrm{d }$of chocolates as Rakesh received and Rakesh received $\frac{1}{2}$as much as Roshan received. What fraction of the total chocolates was received by Rakesh?

Find the simple interest on Rs. 3600 at 4% p.a. for 2 years.

Simple interest on a certain sum of money for 3 year at 8% P.A is half the compound interest on Rs. 4000 for 2 years at 10% P.A. The sum placed on S.I is. 

A mobile is available for Rs 15000 cash or 3 equal installments. If the rate of interest charged is 15% per annum, calculate the monthly installment. 

Ankit and Aniket started a business with Ankit’s initial investment of Rs.7,000 in the business. Ankit withdraws Rs 2000 after two months and Rs 1500 after eight months. If Aniket invests a certain sum in the business at the beginning of the year, leaves it intact and receives Rs.5450 as his share of the total profit of Rs.11970 for the year, find the monthly investment of Aniket in the company.