Question : The price of an edible oil is increased by 25%. To maintain the budget, Sushma reduces the consumption of this oil by 20%. The increase in expenditure due to this edible oil is:
Option 1: 0%
Option 2: 1%
Option 3: 2%
Option 4: 3%
Correct Answer: 0%
Solution : Increase in price = 25% Decrease in consumption = 20% For successive percentage change use the following formula, $x+y+\frac{xy}{100}$, where $x$ and $y$ are percentage increases or decreases, if increases take positive and if decreases take negative. Required change in Expenditure = 25 + (–20) + $\frac{(25)(–20)}{100}$ = 25 – 20 – $\frac{500}{100}$ = 5 – 5 = 0% It means no change will take place in expenditure. Hence, the correct answer is 0%.
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Question : The price of diesel increased by 16%. A person wants to increase his expenditure on diesel by 10% only. By what percentage, correct to one decimal place, should he reduce his consumption?
Option 1: 6.5%
Option 2: 5.2%
Option 3: 3.7%
Option 4: 4.5%
Question : The price of diesel has increased by 26%. A person wants to increase his expenditure by 15% only. By what percentage, correct to one decimal place, should he decrease his consumption?
Option 1: 7.2%
Option 2: 9.5%
Option 3: 8.7%
Option 4: 6.5%
Question : The price of a car is first increased by 35% and after that, the price is decreased by 25% due to a reduction in sales. What is the net percentage change in the final price of the car?
Option 1: Decreases by $2 \frac{1}{5}$%
Option 2: Increases by $2 \frac{1}{3}$%
Option 3: Decreases by $1 \frac{3}{5}$%
Option 4: Increases by $1 \frac{1}{4}$%
Question : The price of an article is first increased by 25% and later on, the price was decreased by 30% due to a reduction in sales. Find the net percentage change in the final price of the article.
Option 1: 11.5% increased
Option 2: 14% decreased
Option 3: 13% increased
Option 4: 12.5% decreased
Question : A number is first increased by 40% and then decreased by 25%, again increased by 15% and then decreased by 20%. What is the net increase/decrease percentage in the number?
Option 1: 7.2% decrease
Option 2: 6.4% increase
Option 3: 3.4% increase
Option 4: 3.4% decrease
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