The sum of money invested at the rate of 5 % p.a simple interest for 10 years becomes ₹3,200 is .

Q. A certain sum of money, invested for 5 years at 8% p.a. simple interest, earns an interest of Rs. 12000. Find:
(i) the sum of money
(ii) the compound interest earned by this money in two years and at 10% p.a. compound interest.

Q. Chang invests a sum of money at $20\%p.a.$ at simple interest. In how many years will the sum become five times the original investment?

Q. A sum of money invested at simple interest becomes Rs. $306$ at the end of $5$ years. If the interest is ${\left(\frac{9}{25}\right)}^{th}$ part of the principal, what is the rate of interest per annum ?

Q. The simple interest of a certain sum of money $Rs.61$ at rate of $5\%$ p.a. for $3$ years is

Q. Sonal invests money in three different schemes for $5$ years, $10$ years and $12$ years at $10\%$ p.a., $12\%$ p.a. and $15\%$ p.a. at simple interest respectively. At the completion of each scheme, she gets the same interest. What is the ratio of her investments?