1.
A sum of money placed at compound interest doubles itself in 4 yr. In how many years will it amount to four times itself?
2.
The difference between the compound interest and simple interest on Rs. 10000 for 2 yr is Rs. 25. The rate of interest per annum is
3.
The simple interest on a sum of money is of the principal and the number of years is equal to the rate percent per annum. The rate percent per annum is equal to
4.
At some rate of simple interest, A lent Rs. 6000 to B for 2 yr and Rs. 1500 to C for 4 yr and received Rs. 900 as interest from both of them together. The rate of interest per annum was
5.
What annual payment will discharge a debt of Rs. 6450 due in 4 yr at 5% per annum simple interest?
6.
In how many years will a sum of money double itself at simple interest per annum?
7.
At what time will Rs. 10000 amount to Rs. 13310 at 20% per annum compounded half-yearly?
8.
In what time Rs. 8000 will amount to Rs. 9261 at 10% per annum compound interest, when the interest is compounded half-yearly?
9.
A certain sum amounts to Rs. 5832 in 2 yr at 8% per annum compound interest, then the sum is
10.
In how many years will a sum of Rs. 800 at 10% per annum compound interest, compounded semi-annually becomes Rs. 926.10?
11.
Simple interest on Rs. 500 for 4 yr at 6.25% per annum is equal to the simple interest on Rs. 400 at 5% per annum for a certain period of time. The period of time is
12.
If the difference between the compound and simple interests on a certain sum of money for 3 yr at 5% per annum is Rs. 15.25, then the sum is
13.
If the simple interest for 6 yr be equal to 30% of the principal, it will be equal to the principal after
14.
The effective annual rate of interest, corresponding to a nominal rate of 6% per annum payable half-yearly is
15.
What annual installment will discharge a debt of Rs? 6450 due in 4 yr at 5% simple interest?
16.
The difference between the simple and compound interest on a certain sum of money for 2 yr at 4% per annum is Rs. 4. The sum is
17.
The compound interest on a certain sum of money at a certain rate for 2 yr is Rs. 40.80 and the simple interest on the same sum is Rs. 40 at the same rate and for the same time. The rate of interest per annum is
18.
A sum of money becomes eight times of itself in 3 yr at compound interest. The rate of interest per annum is
19.
At what rate per cent per annum will the simple interest on a sum of money be of the amount in 10 yr?
20.
The ratio of the principal and the amount after 1 yr is 10: 12. Then, the rate of interest per annum is