Aryan invested an sum of money at an annual simple interest rate of 10%. At the end of four years the amount invested plus inter-est earned was 770. The amount invested was

Arun invested a sum of money at a certain rate of simple interest for a period of 4 yrs,had he invest for six year the total interst earned by him would have bean 50% more than the earlier interest amount. What was the rate of interest per cent per annum?

X invested an amount of Rs. 12000 at the simple interest rate of 10% per annum and another amount at the simple interest rate of 20% per annum. The total interest earned at the end of one year on the total amount invested became 14% per annum. Find the total amount invested invested at 20%.

A man invested a certain amount of money at 4% simple interest p.a and thrice of that amount at 5% p.a. for a year and earned Rs. 228. Find the two amounts invested by the man.

A person invested some amount at the rate of 12% simple interest and the remaining at 10%. He received yearly an interest ofX 130. Had he interchanged the amount invested, he would have received an interest ofX 134. How much money did he invest at different rates?

A sum of money invested at 9% per annum simple interest amounts to Rs. 37760 in 2 years. What will it amount to in 3 years at 10% per annum?

A sum of money invested at a compound interest amounts to 800 in 2 year and 840 in 3 year. The rate of interest is