A sum of money at double the rate of simple interest doubles itself in 10 years. In how much time will that amount be triple of itself?

Alipta got some amount of money from her father. In how many years will the ratio of the money and the interest obtained from it be 10:3 at the rate of 6% simple interest per annum?

Which amount will be Rs 520 in 5 years with simple interest and Rs 568 in 7 years?

The sum of money that will yield Rs. 60 as simple interest at the rate of 6% per annum in 5 years is-

A sum of money becomes two times of itself in 8 years at simple interest, and it becomes four times of itself in 2 years at compound interest, when interest is compounded annually. Find the ratio of the rate of simple interest to the rate of compound interest offered per year.

Rs. 2,000 is invested at 10% p.a. on simple interest. If that interest is added to the principal after every 20 years, the amount will become Rs. 14,000 after

A sum of money was invested at a certain rate of simple interest for 2 years. Had it been invested at 1% higher rate, it would have fetched Rs.192 more interest. The sum of money is-

In what time will the simple interest be $$ {2\over5} $$ of the principal at 8% per annum?