model 5 income & expenditure 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) 15%
(b) 10%
(c) 5%
(d) 20%
The correct answers to the above question in:
Answer: (b)
Let B's salary = Rs.100
C's salary = Rs.400
and A's salary = Rs.40
Required percentage = $40/400 ×100$ = 10%
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Read more income expenditure Based Quantitative Aptitude Questions and Answers
Question : 1
A person gave 20% of his income to his elder son, 30% of the remaining to the younger son and 10% of the balance, he donated to a trust. He is left with Rs.10080. His income was :
a) Rs.30000
b) Rs.40000
c) Rs.50000
d) Rs.20000
Answer »Answer: (d)
Let income be Rs.100
Sum given to elder son = 20% of Rs.100 = Rs.20
Remaining Sum = Rs. 80
Sum given to younger son = 30% of Rs.80 = Rs.24
Remaining sum = Rs.(80 – 24) = Rs. 56
Sum given to the trust = 10% of Rs.56 = Rs.5.6
Remaining sum = Rs.(56 – 5.6) = Rs.50.4
When Rs.50.4 remains, total income = Rs.100
When Rs.10080 remains, total income = ${100 × 10080}/50.4$ = Rs.20000
Using Rule 20,
If a person saves ‘R' rupees after spending x% on food, y% on cloth and z% on entertainment of his income then,
Monthly income = $100/{100 - (x + y +z)}× R$
Here, R = Rs.10080; x = 20%, y = 30%, and z = 10%
Monthly income = $100/{100 – (20 +24 + 5.6)} ×10080$
= $1008000/{100 – 49.6} = 1008000/50.4 = 20,000$
Question : 2
If 60% of A's income is equal to 75% of B's income, then B's income is equal to x% of A's income. The value of x is :
a) 80
b) 60
c) 70
d) 90
Answer »Answer: (a)
Let A's income = Rs.a
and B's income = Rs.b
a × 60% = b × 75%
a × 4 = 5 × b
$b/a = 4/5$
Now, b = a × x%
$b/a = x/100 ⇒ x/100 = 4/5$
$x = 4/5×$ 100 = 80
Question : 3
Given that 10% of A's income = 15% of B's income = 20% of C's income. If sum of their income is Rs.7800, then B's income is:
a) Rs.2400
b) Rs.3000
c) Rs.3600
d) Rs.1800
Answer »Answer: (a)
10% of A = 15% of B = 20% of C
10A = 15B = 20C
${10A}/60 = {15B}/60 = {20C}/60$
$A/6 = B/4 = C/3$
A : B : C = 6 : 4 : 3
6x + 4x + 3x = 7800
13 x = 7800
x = $7800/13$ = 600
B's income = 4x = 600 × 4 = Rs.2400
Question : 4
Income of A is 10% more than income of B. Let B's income be x% less than A's income. Find x.
a) 11%
b) 10$1/11$%
c) 9$1/11$%
d) 10%
Answer »Answer: (c)
Using Rule 8,
Simple method
x = $(10/{100 + 10} × 100)$%
= $(1000/110)% = (100/11)% = 9{1}/11%$
Note : If A is r% more than B, then B is
$(r/{100 + r} × 100)$% less than A
Question : 5
If the monthly salary of an employee is increased by 2$2/3$% , he gets 72 rupees more. His monthly salary (in rupees) is
a) 2700
b) 3600
c) 7200
d) 2000
Answer »Answer: (a)
Suppose monthly income = Rs.x
Then, $8/3$% of x = 72
x × $8/300$ = 72
${72× 300}/8$ = Rs.2700
Question : 6
If Nita's salary is 25 per cent more than Papiya's salary, then the percentage by which Papiya's salary is less than Nita's salary is
a) 25%
b) 20%
c) 15%
d) 32%
Answer »Answer: (b)
Using Rule 8,
If the income of a man is A% more than another man, then income of another man is less in comparison to the 1st man by
$(A/(100 + A)× 100)%$
Required percentage = $25/{100 + 25} × 100$
$25/125 × 100$ = 20%
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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