If doubling a number and adding 20 to the result gives the same answer as multiplying the number by 8 andtaking away 4 from the product, find the number.

A music teacher borrowed ₹8,200 from a friend at 6.5% simple interest per annum. After 3 years, he repaid the amount along with a small donation of ₹280 to his friend's charity. Find the total amount he paid.

Jaspreet deposited a sum of ₹28,450 at 20% rate of interest per annum, compounded annually. The total amount received by Jaspreet after 2 years is:

At what rate (in percentage) per year will a sum of money 5 times itself in 16 years on simple interest?

The amount on a sum of ₹2,800 at the rate of 5% per annum compound interest, compounded annually, in 2 years will be:

The difference between compound interest and simple interest on ₹ 10,000 for 2 years at 10% per annum is

The compound interest on ₹2,000 for one year at 10% per annum, compounded half-yearly, is

A person invested half of his capital at 10% simple interest and the other half at 10% compound interest (compounded annually) for 2 years. If the total interest earned is ₹ 4,100 , his total capital was

The difference between the simple interest and compound interest(compounded half-yearly) on a certain sum at 10% per annum for one year is ₹ 100. The principal sum is equal to

If a sum of money placed at compound interest doubles itself in 2.5 years. In how many years will it become eight times the original sum at the same rate?

A sum of ₹12,000 is invested for 2 years at a certain rate of interest, compounded annually. Had it been invested at a rate 2% higher, it would have earned ₹ 504 more. The original rate of interest is