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Question Detail
Find compound interest on Rs. 7500 at 4% per annum for 2 years, compounded annually
- Rs 312
- Rs 412
- Rs 512
- Rs 612
Answer: Option D
Explanation:
Please apply the formula
\begin{aligned}
Amount = P(1+\frac{R}{100})^n \\
\text{C.I. = Amount - P}
\end{aligned}
1. What will be the difference between simple and compound interest @ 10% per annum on the sum of Rs 1000 after 4 years
- Rs 62.10
- Rs 63.10
- Rs 64.10
- Rs 65.10
Answer: Option C
Explanation:
\begin{aligned}
S.I. = \frac{1000*10*4}{100} = 400 \\
C.I. = [1000(1+\frac{10}{100})^4 - 1000] \\
= 464.10
\end{aligned}
So difference between simple interest and compound interest will be 464.10 - 400 = 64.10
2. The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is
- 4 years
- 5 years
- 6 years
- 7 years
Answer: Option A
Explanation:
As per question we need something like following
\begin{aligned}
P(1+\frac{R}{100})^n > 2P \\
(1+\frac{20}{100})^n > 2 \\
(\frac{6}{5})^n > 2 \\
\frac{6}{5} \times \frac{6}{5} \times \frac{6}{5}\times\frac{6}{5} > 2
\end{aligned}
So answer is 4 years
3. Find compound interest on Rs. 7500 at 4% per annum for 2 years, compounded annually
- Rs 312
- Rs 412
- Rs 512
- Rs 612
Answer: Option D
Explanation:
Please apply the formula
\begin{aligned}
Amount = P(1+\frac{R}{100})^n \\
\text{C.I. = Amount - P}
\end{aligned}
4. Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is
- Rs 1650
- Rs 1750
- Rs 1850
- Rs 1950
Answer: Option B
Explanation:
\begin{aligned}
C.I. = (4000 \times(1+\frac{10}{100})^2 - 4000) \\
= 4000 * \frac{11}{10} * \frac{11}{10} - 4000 \\
= 840 \\
\text{So S.I. = } \frac{840}{2} = 420\\
\text{So Sum = } \frac{S.I. * 100}{R*T} \\
= \frac{420 * 100}{3*8} \\
= Rs 1750
\end{aligned}
5. A sum of money invested at compound interest to Rs. 800 in 3 years and to Rs 840 in 4 years. The rate on interest per annum is.
- 4%
- 5%
- 6%
- 7%
Answer: Option B
Explanation:
S.I. on Rs 800 for 1 year = 40
Rate = (100*40)/(800*1) = 5%
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