Practice Consumption remaining - quantitative aptitude Online Quiz (set-1) For All Competitive Exams
Q-1) 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)
(b)
(c)
(d)
Using Rule 8,
Required per cent = ${25 × 100}/125 = 20%$
Q-2) 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)
(b)
(c)
(d)
Using Rule 8,
Percentage decrease
= $25/125 × 100 = 20%$
Q-3) 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)
(b)
(c)
(d)
Using Rule 8,
Required reduction in consumption
= $\text"x"/\text"100 + x" × 100$% where x = 25
= $25/{100 + 25} × 100 = 20$%
Q-4) 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)
(b)
(c)
(d)
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
= $25/125 × 100 = 20%$
Q-5) Price of sugar rises by 20%. By how much percent should the consumption of sugar be reduced so that the expenditure does not change?
(a)
(b)
(c)
(d)
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
$(A/{(100 + A)}×100)$%
Smart approach
Required percentage decrease
= $\text"Increase"/\text"100 + Increase" × 100$
= $20/{100 + 20} × 100$
= $100/6 = 16{2}/3%$
Q-6) Price of a commodity has increased by 60%. By what per cent must a consumer reduce the consumption of the commodity so as not to increase the expenditure ?
(a)
(b)
(c)
(d)
If the reduction in consumption be x%, then
$60 - x - {60x}/100 = 0$
$60 - x - {3x}/5 = 0$
300 – 5x – 3x = 0
8x = 300 ⇒ x = $300/8 = 37.5%$
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 = $60/160 × 100%$
= $300/8 = 75/2 = 37.5%$
Q-7) If the price of a commodity is increased by 50%, by what fraction must its consumption be reduced so as to keep the same expenditure on its consumption ?
(a)
(b)
(c)
(d)
Using Rule 8,
Required fractional decrease
= $R/{100 + R} = 50/{100 + 50} = 1/3$
Q-8) 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)
(b)
(c)
(d)
Using Rule 8,
Reduction in consumption
= $(R/{100 + R}× 100)%$
= $(20/120×100)% = 50/3% = 16{2}/3%$
Q-9) 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)
(b)
(c)
(d)
Using Rule 8,
Percentage decrease in the consumption of petrol
= $(20/{100 + 20} × 100)$%
= $50/3 = 16{2}/3$%
Q-10) Price of milk has increased by 20%. To keep the expenditure unchanged, the present consumption is to be reduced by :
(a)
(b)
(c)
(d)
Using Rule 8,
Required percentage decrease
= $20/{100 + 20} × 100$
= $50/3 = 16{2}/3$%