1. David invested certain amount in three different schemes A, B and C with the rate of interest 10% p.a., 12% p.a. and 15% p.a. respectively. If the total interest accrued in one year was Rs. 3200 and the amount invested in Scheme C was 150% of the amount invested in Scheme A and 240% of the amount invested in Scheme B, what was the amount invested in Scheme B?

1. Rs.5000

2. Rs.2000

3. Rs.6000

4. Rs.3000

Answer & Explanation

Answer:- 1

Explanation :-

2. A sum of Rs. 1550 was lent partly at 5% and partly at 8% p.a. simple interest. The total interest received after 3 years was Rs. 300. The ratio of the money lent at 5% to that lent at 8% is:

1. 16 : 15

2. 15 : 16

3. 15 : 8

4. 8 : 15

Answer & Explanation

Answer:- 1

Explanation :-

Lets suppose Part of Money lent on 5% be x & part of Money lent on 8% =(1550-x)

SI on x + SI on (1550-x) = 300

[(x*5*3)/100] + [((1500 – x )*8*3)/100] = 300

5x + 8(1500 – x) = 10000

3x = 2400

x = 800

3. A sum of money doubles in 12 years. In how many years, it will treble at S.I.

1. 12 years

2. 8 years

3. 6 years

4. 24 years

Answer & Explanation

Answer:- 4

Explanation :-

Let the sum of money be x

As money is doubled in 12 years i.e.(2x) , Therefore , SI = 2x-x =x

SI=(P*R*T)/100

x=x*R*12/100

R=100/12

If money triples itself, Therefore SI = 3x – x = 2x

2x=x*(100/12)*T

=> T = 24 years

4. A man invests a certain sum of money at 6% per annum simple interest and another sum at 7% per annum simple interest. His income from interest after 2 years was Rs. 354. One-forth of the first sum is equal to one-fifth of the second sum. The total sum invested was :

1. Rs.3100

2. Rs.2700

3. Rs.2200

4. Rs.1800

Answer & Explanation

Answer:- 2

Explanation :-

5. The interest on a certain deposit at 5% per annum is Rs. 101.20 in one year. How much will the additional interest in one year be on the same deposit at 6% per annum?

1. Rs.20.8

2. Rs.19.74

3. Rs.20.24

4. Rs.19.5

Answer & Explanation

Answer:- 3

Explanation :-

P=(SI*100)/RT

P= (101.20*100)/(5*1)=2024

SI for Rs.2024 at 6% per annum for 1 year = (2024*6*1)/100 = 121.44

Additional Interest = 121.44 – 101.20 = Rs.20.24