simple and compound interest Model Questions & Answers, Practice Test for ibps po prelims 2023
ibps po prelims 2023 SYLLABUS WISE SUBJECTS MCQs
Number System
Simplification
Surds & Indices
Ratio & Proportion
Profit & Loss
Time & Work
Simple Interest & Compound Interest
Mensuration: Area & Volumes
In how many years will Rs. 4600 amount to Rs. 5428 at 3 p.c.p.a simple interest?
Answer: (a)
Time = ${\text"\text"S.I""×100}/\text"P×R"={828×100}/{4600×3}$
= 6 years
SI = Amt – principal = 5428 – 4600 = 828
Of a certain sum, $1/3$ rd is invested at 3%, $1/6$th at 6% and the rest at 8%. If the SI for 2 years from all these investments amounts to 600, then the original sum was
Answer: (d)
Remaining part = $1-(1/3+1/6)=1/2$
Average rate % per annum (R)
$=(1/3×3)+(1/6×6)+(1/2×8)=6%$
SI = Rs.600
T = 2 years, P = ?
I=$\text"PTR"/100$
P= ${100×I}/\text"TR"$
= ${100×600}/{2×6}$
= Rs.5000.
Gopi borrowed Rs.1800 at 12% per annum for 2 years and Krishna borrowed Rs.1200 at 18% per annum for 3 years. Then the ratio of interests paid by them is
Answer: (b)
Gopi | Krishna |
P = Rs. 1800 | P = Rs. 1200 |
R = 12% | R = 18% |
T = 2 years | T = 3 years |
$I_1=\text"PTR"/100$ | $I_2=\text"PTR"/100$ |
=${1800×2×12}/100$ | =${1200×3×18}/100$ |
= Rs. 432 | = Rs. 648 |
$I_1 : I_2$ = 432 : 648 = 2 : 3.
A sum of Rs. 2600 is lent out in two parts in such a way that the interest on one part at 10% for 5 years is equal to that on the other part at 9% for 6 years. The sum lent out at 10% is ________ .
Answer: (b)
Ratio of two parts = $r_2 t_2 : r_1 t_1$ = 54 : 50 = 27 : 25
∴ Sum lent out at 10% = ${2600}/{52} × 27$ = Rs.1350
If the simple interest on a certain sum of money for 3 years at 5% is Rs. 150, find the corresponding CI.
Answer: (c)
Whenever the relationship between CI and SI is asked for 3 years of time, we use the formula:
SI = ${{rt}/{100[(1+r/{100})^r -1]}}$ × Cl
150 = ${{5 × 3}/{100[(1+{r}/{100})^3 -1]}}$ × Cl
CI = ${{150 × 100[{9261 - 8000}/8000]}/{5 × 3}}$
= ${150 × 100 × 1261}/{5 × 3 × 8000} = {1261}/{8} $= Rs.157.62
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