simple and compound interest Model Questions & Answers, Practice Test for ibps clerk prelims 2023
ibps clerk prelims 2023 SYLLABUS WISE SUBJECTS MCQs
Ratio & Proportion
Percentages
Profit & Loss
Time & Work
Time & Distance
Simple Interest & Compound Interest
Mensuration: Area & Volumes
Algebraic Expressions
Trigonometric Ratios & Identity
Linear Equations
Quadratic Equations
Logarithm
The simple interest accrued on an amount of Rs. 40000 at the end of three years Rs. 12000. What would be the compound interest accrued on the same amount at the same rate in the same period ?
Answer: (d)
R = ${12000 × 100}/{40000 × 3 }[R = {S.I × 100}/{P × T}]$ = 10%
CI = P$ [(1 + {{r}/{100}})^t -1] = 40000[(1 + {10}/{100})^3 -1]$
= 40000$[({{11}/{10}})^3 -1]$ = 40000$[{1331 - 1000}/{1000}]$
=40000$[{31}/{1000}]$ = 40 × 331 = Rs.13240
S.I. accrued on an amount in eight years @ 11% p.a. is 57200. What was the principal amount?
Answer: (d)
Principal = ${\text"S.I"×100}/\text"R×T"={57200×100}/{11×8}$
= 65000
An amount is lent at y% p.a. S.I for two years. However, is it had been lent at 2y% p.a. S.I. for x more years, then the interest would have been 5 times the earlier interest. Find the value of y.
Answer: (b)
SI=${P×Y×2}/100={2YP}/100$
SI=${P×2Y×(2+X)}/100={2Y(2+X)}/100$
$5×{2YP}/100=2YP{(2+X)}/100$
5 = 2 + x
5 – 2 = x = 3.
A sum of money at simple interest amounts to Rs. 600 in 4 years and Rs. 650 in 6 years. Find the rate of interest per annum.
Answer: (b)
Suppose the rate of interest = r% and the sum = Rs. A
Now, A + ${A + r × 4}/100$ = 600;
or, A + ${Ar}/{25}$ = 600
or, A $[1 + {r/{25}}]$ = 600 ...(1)
And, A + ${A × r × 6}/{100}$ = 650;
or, A $[1 + {{3r}/{50}}]$ = 650...(2)
Dividing (1) by (2), we have
${1 + {r/25}}/{1 + {3r}/{50}} = {600}/{650};$ or, ${(25 + r) × 2}/{50 + 3r} = {12}/{13}$
or, ${(25 + r) × 2}/{50 × 3r} = {12}/{13}$
or, (50 + 2r) × 13 = (50 + 3r) × 12
or, 650 + 26r = 600 + 36r; or, 10r = 50
∴ r = 5%
Some amount out of Rs. 7000 was lent at 6% per annum and the remaining at 4% per annum. If the total simple interest from both the fractions in 5 yrs. was Rs. 1600, find the sum lent at 6% per annum.
Answer: (b)
Suppose Rs. x was lent at 6% per annum.
Thus, ${x × 6 × 5}/{100} + {(7000 - x) × 4 × 5}/{100} = 1600$
${3x}/{10} + {7000 - x}/{5}$ = 1600
or, ${3x + 14,000 - 2x}/{10}$ = 1600
∴ x = 16000 - 14000 = Rs. 2000
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