Question : A sum of Rs. 2000 amounts to Rs. 4000 in two years at compound interest. In how many years will the same amount become Rs. 8000?

Option 1: 2 years

Option 2: 4 years

Option 3: 6 years

Option 4: 8 years

Question : The compound interest on a certain sum of money for 2 years at 5% interest is Rs. 328. The sum is:

Option 1: Rs. 3000

Option 2: Rs. 3600

Option 3: Rs. 3200

Option 4: Rs. 3400

Question : A sum of money invested at compound interest amounts to Rs. 800 in 3 years and to Rs. 840 in 4 years. The rate of interest per annum is:

Option 1: $2\frac{1}{2}$%

Option 2: $4$%

Option 3: $5$%

Option 4: $6\frac{2}{3}$%

Question : A man invested a sum of money at compound interest. It amounted to Rs. 2420 in 2 years and Rs. 2662 in 3 years. Find the sum:

Option 1: Rs. 1000

Option 2: Rs. 2000

Option 3: Rs. 5082

Option 4: Rs. 3000

Question : In 3 years, Rs. 3000 amounts to Rs. 3993 at $x$% compound interest compounded annually. The value of $x$ is ___.

Option 1: $10$

Option 2: $8$

Option 3: $5$

Option 4: $3\frac{1}{3}$