model 5 income & expenditure Section-Wise Topic Notes With Detailed Explanation And Example Questions

MOST IMPORTANT quantitative aptitude - 11 EXERCISES

Top 10,000+ Aptitude Memory Based Exercises

The following question based on percentage topic of quantitative aptitude

Questions : X's income is 20% more than that of Y. What per cent is Y's income less than X ?

(a) 83$2/3$%

(b) 16$2/3$%

(c) 83$1/3$%

(d) 16$1/3$%

The correct answers to the above question in:

Answer: (b)

Using Rule 8,

Required percentage = $20/{100 + 20} × 100$

= $50/3 =16{2}/3%$

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Read more income expenditure Based Quantitative Aptitude Questions and Answers

Question : 1

If the total monthly income of 16 persons is Rs.80,800 and the income of one of them is 120% of the average income, then his income is

a) Rs.6,160

b) Rs.6,060

c) Rs.5,050

d) Rs.6,600

Answer: (b)

Let the required income be Rs.x Average monthly income

= Rs.$(80800/16)$ = Rs.5050

x = 120% of 5050

= Rs.$(120/100 × 5050)$ = Rs.6060

Question : 2

A man spends 75% of his income. His income increased by 20% and he increased his expenditure by 15%. His savings will then be increased by

a) 35%

b) 33$1/3$%

c) 33%

d) 40%

Answer: (a)

Let man's income = Rs.100

Savings = 100 – 75 = Rs.25

New income = Rs.120

Savings = $120 - {75 × 115}/100 = 120 - 345/4$

= ${480 – 345}/4 = Rs.135/4$

Increase in savings =$135/4 - 25 = Rs.35/4$

Percentage increase = ${35/4}/25 × 100 = 35%$

Question : 3

A person who spends 66$2/3$% of his income is able to save Rs.1,200 per month. His monthly expenses (in Rs.) is :

a) 3,000

b) 2,400

c) 1,200

d) 3,200

Answer: (b)

Savings = 100% - 66$2/3$%

= 33$1/3$% Since, 33$1/3$% ≡ Rs.1200

100% ≡ $1200/100 ×3 × 100$ = Rs.3600

Expenses = 3600 - 1200 = Rs.2400

Aliter : 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.1200; x = 66$2/3$%

Monthly income = $100/{100 - 66{2}/3} × 1200$

= $100/{100 - 200/3} × 1200$

= $300/100 × 1200$ = Rs.3600

Expenses = Income – savings = 3600 – 1200 = 2400

Question : 4

Radha spends 40% of her salary on food, 20% on house rent, 10% on entertainment and 10% on conveyance. If her savings at the end of a month are Rs.1500, then her salary per month (in Rs.) is

a) Rs.6000

b) Rs.7500

c) Rs.8000

d) Rs.10000

Answer: (b)

Radha's total percentage expenditure

= (40 + 20 + 10 + 10)% = 80%

Percentage savings =100 – 80 = 20%

Now, 20% of her total salary = 1500

Her total salary = ${1500 ×100}/20$ = Rs.7500

Using Rule 20,

Here, Monthly income = $100/{100 - (40 + 20 +10 +10)} ×1500$

= $150000/{100 – 80} = 150000/20$ =Rs.7500

Question : 5

What per cent decrease in salaries would exactly cancel out the 20 per cent increase?

a) 33$1/3$%

b) 16$2/3$%

c) 20%

d) 18%

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

$(A/(100 + A)× 100)%$

Simple method

Required answer = $(20/{100 + 20} × 100)$%

= $(20/120 × 100)% = 50/3% = 16{2}/3%$

Question : 6

The salary of a person is decreased by 25% and then the decreased salary is increased by 25%. His new salary in comparison with his original salary is

a) 6.25% less

b) 6.25% more

c) the same

d) 0.625% less

Answer: (a)

Effective change

= $(–25 + 25 - {25 × 25}/100)%$ = – 6.25%

The negative sign shows decrease.

Using Rule 3,

If an amount is increased by a% and then it is reduced by a% again, then percentage change will be a decrease of $a^2/100%$

Percentage decrease = $a^2/100 % = (25)^2/100$

= $625/100$ = 6.25%

Need More Mcqs on percentage of model 5 income & expenditure Click Here »
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
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