Model 8 population based Section-Wise Topic Notes With Detailed Explanation And Example Questions
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The following question based on percentage topic of quantitative aptitude
(a) Rs.750.87
(b) Rs.1000
(c) Rs.947.10
(d) Rs.800
The correct answers to the above question in:
Answer: (b)
Using Rule 18,
If the price of machine 3years ago be Rs.x. then
729 = $x(1 -10/100)^3$
729 = $x(9/100)^3$ ⇒ x = Rs.1000
Discuss Form
Read more population based Based Quantitative Aptitude Questions and Answers
Question : 1
A district has 64000 inhabitants. If the population increases at the rate of 2$1/2$% per annum, the number of inhabitants at the end of 3 years will be
a) 69200
b) 70000
c) 68921
d) 68911
Answer »Answer: (c)
Using Rule 17,
$P = P_0(1 + R/100)^T$
= $64000(1 + 5/200)^3$
= $64000(41/40)^3$
= ${64000 × 41 × 41× 41}/{40 × 40 × 40}$ = 68921
Question : 2
The population of a village decreases at the rate of 20% per annum. If its population 2 years ago was 10,000, the present population is
a) 6400
b) 4600
c) 7600
d) 6000
Answer »Answer: (a)
Using Rule 17,
Present population = $10000(1 - 20/100)^2$
= $10000 × 4/5 × 4/5 = 6400$
Question : 3
In a village panchayat society 574 names are enlisted as ‘below poverty level'. If 14% of the villagers are below poverty level, the total number of villagers is
a) 4200
b) 4100
c) 4000
d) 3800
Answer »Answer: (b)
Let the total population of village be x.
According to the question,${x × 14}/100 = 574$
$x = {574 × 100}/14$ = 4100
Question : 4
The population of a town increases by 5% every year. If the present population is 9261, the population 3 years ago was
a) 5700
b) 8000
c) 6000
d) 7500
Answer »Answer: (b)
Using Rule 17,
P = $P_0(1 + R/100)^T$
9261 = $P_0(1 + 5/100)^3$
9261 = $P_0(1 + 1/20)^3$
9261 = $P_0(21/20)^3$
$P_0 = {9261 × 20 × 20 × 20}/{21 × 21 × 21}$ = 8000
GET percentage PRACTICE TEST EXERCISES
model 1 simple percentage questions
model 2 net increase or decrease in %
model 3 reducing & exceeding prices
model 4 x & y comparison
model 5 income & expenditure
model 6 consumption & remaining
model 7 marks scored in examinations
Model 8 population based
model 9 voters & election
model 10 percentage with allegations & mixture
model 11 percentage with ratios
percentage Shortcuts and Techniques with Examples
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model 1 simple percentage questions
Defination & Shortcuts … -
model 2 net increase or decrease in %
Defination & Shortcuts … -
model 3 reducing & exceeding prices
Defination & Shortcuts … -
model 4 x & y comparison
Defination & Shortcuts … -
model 5 income & expenditure
Defination & Shortcuts … -
model 6 consumption & remaining
Defination & Shortcuts … -
model 7 marks scored in examinations
Defination & Shortcuts … -
Model 8 population based
Defination & Shortcuts … -
model 9 voters & election
Defination & Shortcuts … -
model 10 percentage with allegations & mixture
Defination & Shortcuts … -
model 11 percentage with ratios
Defination & Shortcuts …
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