
Percentage Change Quiz
Authored by Sethu Ram
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24 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A number is first decreased by 5% and then increased by 5%. What will be the net increase or decrease?
0.25% increase
25% decrease
0.25% decrease
No increase or decrease
Answer explanation
When a number is decreased by 5%, it becomes 95% of the original. Increasing this new value by 5% results in 95% * 1.05 = 99.75% of the original, leading to a net decrease of 0.25%.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a number is increased by 20% and then it is decreased by 10%. Its net increase or decrease is:
8% increase
10% decrease
10 % increase
8% decrease
Answer explanation
Increasing a number by 20% gives 1.2x, and decreasing that result by 10% gives 1.2x * 0.9 = 1.08x. This is an 8% increase from the original number, confirming the correct answer is 8% increase.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The profit of a company increased by 10% from April to May, then it decreased by 20% from May to June and again increased by 50% from June to July. What was the % growth in profit from April to July?
15%
45%
32%
13%
Answer explanation
Let the profit in April be 100. After a 10% increase in May, it becomes 110. A 20% decrease in June brings it to 88. Finally, a 50% increase in July results in 132. The growth from April to July is (132-100)/100 * 100 = 32%.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The price of a book was first increased by 25% and then reduced by 20%. What is the change in its original price?
5% decrease
No change
10% increase
10% decrease
Answer explanation
The book's price increases by 25%, then decreases by 20% of the new price. The final price is 100% of the original, resulting in no overall change in price.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the consumption of sugar increases from 12 kg to 15 kg, then find the percentage growth.
39.2%
20%
25%
33.3%
Answer explanation
To find the percentage growth, use the formula: ((new value - old value) / old value) * 100. Here, ((15 kg - 12 kg) / 12 kg) * 100 = (3/12) * 100 = 25%. Thus, the correct answer is 25%.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The price of rice is increased from ` 25 per kg to ` 30 per kg. The consumption should be reduced to what percentage so that the expenditure remains the same?
2 16 % 3
1 8 % 3
10%
16%
Answer explanation
The price increase from `25 to `30 means a 20% increase. To keep expenditure constant, consumption must decrease by 20%. Thus, the required reduction in consumption is 16.67%, which rounds to 16%. Hence, the correct choice is 2 16 % 3.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When the price of a cycle decreased by 20%, then the number of selling of bicycles increased by 20%. What was the effect on sale of the shop?
4% decrease
4% increase
10% increase
10% decrease
Answer explanation
The price decrease of 20% leads to a 20% increase in sales volume. However, the revenue change is calculated as follows: Revenue = Price x Quantity. A 20% drop in price and a 20% rise in quantity results in a net 4% decrease in revenue.
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