Vidaara.orgClass 9 · Mathematics
CodeVID-M09-16-FRM-01
Compound Interest Formula - Assignment
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
- Show all working for Sections B, C and D. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions
5 × 1 = 5 marks
1.
The compound amount formula is:
- A.$A=P(1+\tfrac{R}{100})^n$
- B.$A=P+\tfrac{PRT}{100}$
- C.$A=\tfrac{PRT}{100}$
- D.$A=Pn$
2.
Compound interest $=$
- A.$A+P$
- B.$A-P$
- C.$P-A$
- D.$A\times P$
3.
For $P=1000$, $R=10\%$, $n=2$, $A=$
- A.Rs $1100$
- B.Rs $1200$
- C.Rs $1210$
- D.Rs $1320$
4.
In the formula, $n$ is the number of:
- A.rupees
- B.years (periods)
- C.rates
- D.principals
5.
CI on Rs $1000$ at $10\%$ for $2$ years is:
- A.Rs $200$
- B.Rs $210$
- C.Rs $100$
- D.Rs $220$
Section B — Short Answer (2 marks)
4 × 2 = 8 marks
6.
Find $A$ for $P=2000$, $R=10\%$, $n=2$.
7.
Find the CI for $P=2000$, $R=10\%$, $n=2$.
8.
Find $A$ for $P=5000$, $R=10\%$, $n=1$.
9.
Write the formula for the compound amount.
Section C — Short Answer (3 marks)
4 × 3 = 12 marks
10.
Find the CI on Rs $4000$ at $5\%$ per annum for $2$ years.
11.
Find the amount on Rs $6250$ at $8\%$ per annum for $2$ years.
12.
Find the CI on Rs $12500$ at $12\%$ for $2$ years.
13.
Find the amount on Rs $8000$ at $10\%$ for $3$ years.
Section D — Long Answer (5 marks)
2 × 5 = 10 marks
14.
Find the compound interest on Rs $15625$ at $4\%$ per annum for $3$ years.
15.
A sum of Rs $10000$ amounts to Rs $13310$ in $3$ years at compound interest. Find the rate per annum.
Answer Key
Section A — Multiple Choice Questions
- (A) $A=P(1+\tfrac{R}{100})^n$
- (B) $A-P$
- (C) Rs $1210$
- (B) years (periods)
- (B) Rs $210$
Section B — Short Answer (2 marks)
- Rs $2420$.
- Rs $420$.
- Rs $5500$.
- $A=P\left(1+\tfrac{R}{100}\right)^n$.
Section C — Short Answer (3 marks)
- Rs $410$.
- Rs $7290$.
- Rs $3180$.
- Rs $10648$.
Section D — Long Answer (5 marks)
- Rs $1951$.
- $10\%$.
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