Model 8 population based Practice Questions Answers Test with Solutions & More Shortcuts
percentage PRACTICE TEST [11 - 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
Question : 31 [SSC CGL Tier-I 2016]
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 : 32
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 : 33
The value of a machine depreciates every year at the rate of 10% on its value at the beginning of that year. If the current value of the machine is Rs.729, its worth 3years ago was:
a) Rs.750.87
b) Rs.1000
c) Rs.947.10
d) Rs.800
Answer »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
Question : 34
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
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Model 8 population based Shortcuts »
Click to Read...Model 8 population based Online Quiz
Click to Start..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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