CLASS-8

BOARD: CBSE

Mathematic Worksheet - 8

TOPIC: S.I and C.I

For other**CBSE Worksheet for class 8 Mathematic **check out main page of Physics Wallah.

If S.I. is Simple Interest, P is Principle, A is Amount, R% is rate of interest and T is time.

Then:

If A is the amount, P is the principle; R% is the rate of interest compounded annually and n is number of intervals,

**1. In what time will Rs 64000 amount to Rs 68921 at 5% per annum, interest being compounded half- yearly?**

(A) 5/3

(B) 5/2

(C) 4/2

(D) 5/4

**2. In the difference between the C.I. and S.I. at the end of 2 years is Rs 100, what is the principal? Rate is 5% per annum in both the cases. Assume same principal for both the cases.**

(A) Rs 50,000

(B) Rs 40,000

(C) Rs 10,000

(D) None of these

**3. The compound interest on Rs 5000 at 4% per annum for 2 years compounded annually is:**

(A) Rs804

(B) Rs 708

(C) Rs 408

(D) Rs 5408

**4. Find the compound interest on Rs 15625 for 9 months, at 16% per annum, compounded quarterly.**

(A) Rs1250

(B) Rs 1651

(C) Rs 1951

(D) Rs 2651

**5. Difference between C.I & S.I. in a certain amount at 10% per annum for 2 yrs compounded annually is Rs 282. Find the principal.**

(A) Rs28210

(B) Rs 28120

(C) Rs 28200

(D) None

**6. If an amount is kept at S.I., it earns an interest of Rs 600 in first 2 years but when kept at C.I., it earns an interest of Rs 660 in the same period. The rate of interest will be:**

(A) 10%

(B) 20%

(C) 30%

(D) None of these

**7. A bacteria reproduces at the rate of 50% in every 15 min. in how much time will it be 27/8 times itself?**

(A) 105 min

(B) 45 min

(C) 75 min

(D) 50 min

**8. The population of a town increases 20% annually. What is the population after two years if present population is 2500?**

(A) 3250

(B) 3500

(C) 3600

(D) 4000

**9. A sum of Rs 8000 at compound interest becomes double after 5 years. After 20 years it will become:**

(A) Rs 80000

(B) Rs 96000

(C) Rs 128000

(D) Rs 160000

**1. Find the rate of interest at which a sum becomes four times of itself in 15 years at S.I.**

**2. How long will it take a sum of money invested at 5% p.a. S.I. to increase its value by 40%?**

**3. In what time a sum of Rs 2700 amounts to Rs 3240 at a rate of at S.I.**

**4. Find the amount of Rs 8000 for 3 years, compounded annually at 5% per annum. Also, find the compound interest.**

**5. At what rate percent per annum will a sum of Rs 2000 amount to Rs 2205 in 2 years, compounded annually?**

**6. The present population of town is 25000. It grows at the rate of 4%, 5% and 8% during the first year, second year and third year respectively. Find its population after 3 years.**

1) C

2) B

3) C

4) C

5) C

6) B

7) B

8) C

9) C

1) 20%

2) 8 years

3) 3 years

4) Rs 9261; Rs 1261

5) 5%

6) 29484