model 2 net increase or decrease in % 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 : 6 [SSC CHSL 2013]
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).
Question : 7
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 : 8 [SSC CGL Tier-II 2013]
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 : 9 [SSC CAPFs SI 2014]
The difference between the value of the number increased by 20% and the value of the number decreased by 25% is 36. Find the number.
a) 0.8
b) 80
c) 720
d) 7.2
Answer »Answer: (b)
Let the number be x.
(20 + 25)% of x = 36
${45x}/100 = 36$
$x = {36 × 100}/45$ = 80
Question : 10 [SSC CGL Prelim 2007]
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.
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model 2 net increase or decrease in % Shortcuts »
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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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