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Question 1:

A scheme invests Rs. 1000 at simple interest rate of $5 \%$ on the condition that interest will be added to the principal after 10 yr. In how many years will it amount to Rs.2000?

Question 2:

How much of the principal amount at $6 \%$ per annum simple interest in 10 years yields Rs 120 ?

Question 3:

A sum of money doubles in 4 years at compound interest. That amount will become 8 times of itself at the same rate of interest in the following time

Question 4:

A sum of money kept at simple interest amounts to ₹ 820 in 3 years and to ₹ 894 in 4 years. What will be the interest accumulated after 9 years?

Question 5:

The simple interest on a certain sum at $r \%$ p.a. is $\frac{4}{25}$ of the sum in $r$ years. What is the value of $r$ ?

Question 6:

A certain sum amounts to ₹$ 10,755$ in 3 years and to ₹ $12,510$ in 6 years at the same rate per cent per annum at simple interest. What will be the simple interest on a sum of ₹ 8,500 for $4 \frac{2}{5}$ years at double the earlier rate?

Question 7:

Find the simple interest accrued on an amount of ₹ 2,400 from 20 March 2019 to 31 May 2019 at the rate of $6 \frac{1}{4} \%$ per annum.

Question 8:

A lent ₹ 26,000 to B for 2 years and ₹ 15,000 to C for 4 years. He received altogether ₹ 8,960 as simple interest from both. What is the interest rate?

Question 9:

If in 3 years a sum of ₹ 1,900 becomes ₹ 2,100 at a certain rate of simple interest, then in 5 years at the same rate of interest ₹ 11,400 will become?

Question 10:

A sum of ₹ 15,500 amounts to ₹ 19,189 in $3 \frac{1}{2}$ years at a certain rate per cent per annum, at simple interest. The simple interest on the same sum at the same rate for $6 \frac{2}{3}$ years will be (nearest to a ₹):