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 : 11
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 : 12 [SSC MTS 2011]
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 : 13 [SSC FCI 2012]
A number is first increased by 10% and then it is further increased by 20%. The original number is increased altogether by
a) 15%
b) 36%
c) 32%
d) 30%
Answer »Answer: (c)
Using Rule 7,
Required percentage increase
= $(10 + 20 + {10 × 20}/100)%$= 32%
Question : 14 [SSC CGL Tier-II 2014]
If each side of a cube is increased by 10% the volume of the cube will increase by
a) 10%
b) 25%
c) 33.1%
d) 30%
Answer »Answer: (c)
Single equivalent increase for 10% and 10%
= $(10 + 10 + {10 × 10}/100)$% = 21%
Again, single equivalent increase for 21% and 10%
= $(21 + 10 + {21 × 10}/100)%$
= 31 + 2.1 = 33.1%
Using Rule 14,
"If every side of cube is increased by a%, then increase % in volume"
= $(3a + {3a^2}/100 + a^3/(100)^2)$%
Increase % in volume
= $(3 × 10 + {3 × 10^2}/100 + 10^3/(100)2)%$
=$(30 + 3 + 1/10)$ = 33.1%
Note : Volume of cube = $(Edge)^3$
Hence, formula $(x + y + {xy}/100)%$ should be used twice.
Question : 15 [SSC CGL Tier-1 2011]
When the price of an article was reduced by 20% its sale increased by 80%. What was the net effect on the sale?
a) 44% decrease
b) 75% increase
c) 66% increase
d) 44% increase
Answer »Answer: (d)
Using Rule 5,
Required effect = $(80 - 20 - {80 × 20}/100)%$
=(60 – 16)% = 44%
Positive sign shows increase.
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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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