1. At what rate of interest per annum at simple interest will an amount get doubled in 10 years?
8%
10%
12%
Cannot be determined
None of these
Solution:

2. A sum of money lent out at simple interest amounts to Rs 720 after 2 years and to Rs 1,170 after 7 years. Find the rate%
10%
16 2/3%
15%
12%
None of these

Solution:
3. Adam borrowed some money at the rate of 6% p.a. for the first two years, at the rate of 9% p.a. for the next three years, and at the rate of 14% p.a. for the period beyond five years. If he pays a total interest of Rs 19,000 at the end of nine years, how much money did he borrow?
Rs 10,000
Rs 20,000
Rs 14,000
Rs 16,000
None of these

Solution:
4. A person borrows Rs 5000 for 99 years at 4% p.a. simple interest. He immediately lends it to another person at 6.25% p.a. for 99 years. Find his gain in the transaction per year
Rs 112.50
Rs 125
Rs 150
Rs 167.50
None of these

Solution:
5. Ram claims to be lending money at simple interest, but he includes the interest every six months for calculating the principal. If he is charging an interest of 20%, the effective rate of interest becomes
21.5%
21%
20%
Cannot be determined
None of these

Solution:
6. A lent Rs 2500 to B for 4 years and Rs 4000 to C for 3 years on simple interest at the same rate of interest and received Rs 4400 in all from both of them as interest. The rate of interest per annum is:
25%
17%
22%
20%
None of these

Solution:
7. A sum of Rs 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of Rs 362.50 more is lent but at the rate twice the former. At the end of the year, Rs 29 is earned as interest from both the loans. What was the original rate of interest?
3.6%
4.5%
5%
3%
None of these

Solution:
8. The difference between the simple interest received from two different sources on Rs 1500 for 3 years is Rs 1.350. The difference between their rates of interest is:
0.01%
0.02%
0.03%
0.3%
None of these

Solution:
9. An amount of Rs 1,00,000 is invested in two types of shares. The first yields an interest of 9% p.a. and the second, 13% p.a. If the total interest at the end of one year is 10%, then the amount invested in each share was:
Rs 52,500, Rs 47,500
Rs 75,000, Rs 25,000
Rs 72,500, Rs 27,500
Rs 82,500, Rs 17,500
None of these

Solution:
10. A person invested in all Rs. 2600 at 4%, 6% and 8% per annum simple interest. At the end of the year, he got the same interest in all three cases. The money invested at 4% is:?
1000
1500
1800
1200
2000
Solution: