model 6 consumption & remaining Section-Wise Topic Notes With Detailed Explanation And Example Questions

MOST IMPORTANT quantitative aptitude - 11 EXERCISES

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The following question based on percentage topic of quantitative aptitude

Questions : If the price of rice be raised by 25%, the percent by which a house-holder must reduce his consumption of rice so as not to increase his expenditure on rice is

(a) 20%

(b) 25.75%

(c) 225%

(d) 25%

The correct answers to the above question in:

Answer: (a)

Using Rule 8,

Percentage decrease

= $25/125 × 100 = 20%$

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Read more consumption remaining Based Quantitative Aptitude Questions and Answers

Question : 1

In the new budget, the price of kerosene oil rose by 25%. By how much per cent must a person reduce his consumption of kerosene oil so that his expenditure on it does not increase ?

a) 40%

b) 25%

c) 20%

d) 50%

Answer: (c)

Using Rule 8,

Required reduction in consumption

= $\text"x"/\text"100 + x" × 100$% where x = 25

= $25/{100 + 25} × 100 = 20$%

Question : 2

The price of a commodity rises from 6 per kg to 7.50 per kg. If the expenditure cannot increase, the percentage of reduction in consumption is

a) 30%

b) 20%

c) 15%

d) 25%

Answer: (b)

Using Rule 2,

If x is increased to $x_1$ , then, Increment% = ${x_1 - x}/x ×$100

Percentage increase

= ${7.50 - 6}/6 × 100 = 25%$

Percentage decrease in consumption

= $25/125 × 100 = 20%$

Question : 3

If the price of petrol be raised by 20%, then the percentage by which a car owner must reduce his consumption so as not to increase his expenditure on petrol is

a) 15$1/3$%

b) 16$2/3$%

c) 16$1/3$%

d) 15$2/3$%

Answer: (b)

Using Rule 8,

Percentage decrease in the consumption of petrol

= $(20/{100 + 20} × 100)$%

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

Question : 4

The price of petrol is increased by 25%. By how much per cent a car owner should reduce his consumption of petrol so that the expenditure on petrol would not be increased ?

a) 20%

b) 30%

c) 25%

d) 50%

Answer: (a)

Using Rule 8,

Required per cent = ${25 × 100}/125 = 20%$

Question : 5

If the price of tea is increased by 20%, by how much per cent the consumption of tea be reduced so that there is no increase in the expenditure on it ?

a) 8$1/3$%

b) 20%

c) 83$1/3$%

d) 16$2/3$%

Answer: (d)

Using Rule 8,

Reduction in consumption

= $(R/{100 + R}× 100)%$

= $(20/120×100)% = 50/3% = 16{2}/3%$

Question : 6

The price of a certain item is increased by 15%. If a consumer wants to keep his expenditure on the item the same as before, how much per cent must he reduce his consumption of that item ?

a) 10$20/23$%

b) 13$1/23$%

c) 15%

d) 16$2/3$%

Answer: (b)

Using Rule 8,

If the income of a man is A% more than another man, then the income of another man is less in comparison to the 1st man by

$(A/{(100 + A)}×100)$%

If the price of a commodity increases by R%, then reduction in consumption, not to increase the expenditure is given by

$(R/{100 + R} × 100)$%

= $15/{100 + 15} × 100 = 15/115 × 100$

= $300/23 =13{1}/23$%

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