model 2 net increase or decrease in % 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) 0.8
(b) 80
(c) 720
(d) 7.2
The correct answers to the above question in:
Answer: (b)
Let the number be x.
(20 + 25)% of x = 36
${45x}/100 = 36$
$x = {36 × 100}/45$ = 80
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Read more net increase or decrease Based Quantitative Aptitude Questions and Answers
Question : 1
The length of a rectangle is increased by 10% and breadth decreased by 10% Then the area of the new rectangle is
a) increased by 1%
b) decreased by 10%
c) decreased by 1%
d) neither decreased nor increased
Answer »Answer: (c)
Using Rule 7,
Net effect = $(x + y + {xy}/100)%$
= $(10 - 10 - {10 × 10}/100)$% = -1%
Negative sign shows decrease.
Question : 2
The tax imposed on an article is decreased by 10% and its consumption increases by 10%. Find the percentage change in revenue from it.
a) 2% decrease
b) 11% increase
c) 1% decrease
d) 10% increase
Answer »Answer: (c)
Using Rule 3,
If an amount is increased by a% and then it is reduced by a% again, then the percentage change will be a decrease of $a^2/100$%
Special approach:
Required change = $(10)^2/100%$ decrease
= 1% decrease
Question : 3
When the price of cloth was reduced by 25%, the quantity of cloth sold increased by 20%. What was the effect on gross receipt of the shop?
a) 5% decrease
b) 10% decrease
c) 10% increase
d) 5% increase
Answer »Answer: (b)
Using Rule 5,
Required per cent effect = $(20 - 25 - {20 × 25}/100)%$
=(–5 – 5)% = – 10%
Negative sign shows decrease
Question : 4
A number increased by 22$1/2$% gives 98. The number is
a) 18
b) 81
c) 80
d) 45
Answer »Answer: (c)
If the number be x, then $x × 245/200 = 98$
$x = {98 × 200}/245 = 80$
Question : 5
The cost of an article worth Rs.100 is increased by 10% first and again increased by 10%. The total increase in rupees is
a) 21
b) 121
c) 110
d) 20
Answer »Answer: (a)
Using Rule 7,
Percentage effect = $(10 + 10 + {10 × 10}/100)$% = 21 %
Increase = Rs.21
Question : 6
If a number is increased by 25% and the resulting number is decreased by 25%. then the percentage increase or decrease finally is
a) decreased by $6{1}/4$%
b) increased by 6%
c) increased by $6{1}/4$%
d) no change
Answer »Answer: (a)
Using Rule 4,
Effective value = $(x + y +{xy}/100)$%
= $(25 - 25 - {25 × 25}/100)%$
[Here, x = 25, y = –25]
= –6.25% = $6{1}/4$% decreased
(Negative value shows decrease).
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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