type 3 money multiples in ‘n’ years Practice Questions Answers Test with Solutions & More Shortcuts
simple interest PRACTICE TEST [6 - EXERCISES]
type 1 basic simple interest using formula
type 2 increase or decrease in interest rate
type 3 money multiples in ‘n’ years
type 4 difference & equality of si rate & years
type 5 si on ‘n’ years & ‘x/y ‘of sum
type 6 si with ratios
Question : 6 [SSC CPO S.I.2005]
A certain sum of money becomes three times of itself in 20 years at simple interest. In how many years does it become double of itself at the same rate of simple interest ?
a) 10 years
b) 8 years
c) 14 years
d) 12 years
Answer »Answer: (a)
Case-I
Let the principal be x
Amount = 3x
Interest = 2x
Time = 20 years
I = $\text"PRT"/100$
2x = ${x × R × 20}/100$ ⇒ R = 10%
Case-II
I = x, P = x, R = 10, T = ?
I = $\text"PRT"/100$
x = ${x × 10 × T}/100$ ⇒ T = 10 years.
Using Rule 3,
R% = ${(3 - 1)}/20$ × 100% = 10%
Now, T = ${(n - 1)}/R$ years
T = ${2 - 1}/10 × 100$ = 10 years
Question : 7 [SSC CGL Tier-I 2016]
If a sum of money deposited in a bank at simple interest is doubled in 6 years, then after 12 years, the amount will be
a) 3 times the original amount
b) $5/2$ times the original amount
c) 4 times the original amount
d) $7/2$ times the original amount
Answer »Answer: (a)
Case I,
Principal = Rs.x
Interest = Rs.x
Time = 6 years
Rate = ${Interest × 100}/\text"Principal × Time"$
= ${x × 100}/{x × 16} = 50/3%$ per annum
Case II,
Interest = ${x × 12 × 50}/{100 × 3}$ = Rs.2x
i.e., Amount is thrice the principal.
Question : 8 [SSC DEO 2008]
In how much time, will a sum of money become double of itself at 15% per annum simple interest?
a) 6$1/2$ years
b) 6$1/4$ years
c) 6$2/3$ years
d) 6$1/3$ years
Answer »Answer: (c)
If the principal be x, the amount = 2x
SI = x
Time = ${SI × 100}/\text"Principal × Rate"$
= ${x × 100}/{x × 15} = 20/3 = 6{2}/3$ years
Using Rule 3,
T = ${(n - 1)}/R × 100%$
= $({2 - 1}/15) × 100$
= $100/15 = 20/3$ Years
= 6$2/3$ years
Question : 9 [SSC CHSL 2012]
In how many years will a sum of money double itself at 12% per annum?
a) 6 yrs. 9 months
b) 8 yrs. 6 months
c) 7 yrs. 6 months
d) 8 yrs. 4 months
Answer »Answer: (d)
If the principal be Rs.100 then S.I. = Rs.100.
Time = ${SI × 100}/\text"Principal × Rate"$
= ${100 × 100}/{100 × 12} = 25/3$ years
= 8 years 4 months
Using Rule 3,
T = ${(n - 1)}/R × 100%$
= ${(2 - 1)}/12 × 100%$
= $100/12 = 25/3$ years.
= 8$1/3$ years
= 8 years, 4 months.
Question : 10 [SSC CGL Prelim 2005]
At what rate per cent per annum will the simple interest on a sum of money be $2/5$ of the amount in 10 years ?
a) 6%
b) 4%
c) 6$2/3$%
d) 5$2/3$%
Answer »Answer: (c)
Using Rule 1Simple Interest (S.I.)= ${\text"Principal × Rate × Time"/100$ orS.I. = ${\text"P × R × T"/100$P = ${\text"S.I." × 100}/\text"R × T"$, R = ${\text"S.I." × 100}/\text"P × T"$, T = ${\text"S.I." × 100}/\text"P × R"$ A = P + S.I. or S.I. = A - P
Let P be the principal and R% rate of interest.
S.I. = ${\text"PR" × 10}/100 = \text"PR"/10$
According to the question,
${PR}/10 = (P + {PR}/10) × 2/5$
$R/10 = (1 + R/10) × 2/5$
$R/10 = 2/5 + R/25$
$R/10 - R/25 = 2/5$
${5R - 2R}/50 = 2/5$
${3R}/50 = 2/5$
R = ${50 × 2}/{3 × 5} = 20/3 = 6{2}/3$%
IMPORTANT quantitative aptitude EXERCISES
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Top 999+ Aptitude Simple Interest MCQ: SSC Practice Test »
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Top 799+ Simple Interest Question and Answer Test for SSC »
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New 750+ Simple Interest MCQ with Ratios For All BANK SSC »
type 3 money multiples in ‘n’ years Shortcuts »
Click to Read...type 3 money multiples in ‘n’ years Online Quiz
Click to Start..simple interest Shortcuts and Techniques with Examples
-
type 1 basic simple interest using formula
Defination & Shortcuts … -
type 2 increase or decrease in interest rate
Defination & Shortcuts … -
type 3 money multiples in ‘n’ years
Defination & Shortcuts … -
type 4 difference & equality of si rate & years
Defination & Shortcuts … -
type 5 si on ‘n’ years & ‘x/y ‘of sum
Defination & Shortcuts … -
type 6 si with ratios
Defination & Shortcuts …
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