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Questions and Answers
Find the rate of discount given on a shirt whose selling price is ₹1092 after deducting a discount of ₹208 on its marked price.
16%
A scooter was bought at the cost of ₹42,000. Its value drops down to the rate of 8% per annum. Find its value after one year.
₹38,640
If a particular football team won 10 matches out of all the total number of matches they played and their winning percentage was 40%, how many matches did they play?
25
In a particular school, there are 456 girls. Compute the total number of students if 24% of the total students are boys.
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If ₹12,000 was borrowed at a rate of 6% per annum simple interest for 2 years, how much extra amount would need to be paid if the same sum was borrowed at a rate of 6% per annum compound interest?
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Find the cost price when SP = ₹34.40 and Gain = 7 ½ %
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₹62500 for 1½ years at 8% per annum compounded half yearly.
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In a certain laboratory, the bacteria count increased at 2.5% per hour. Find the bacteria count at the end of exactly 2 hours if the initial count was 5,06,000.
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If a person shops and spends 75% of his money and is left with Rs. 600, find out how much he had in the beginning.
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A student scored 150 out of 200 in the subject maths and got 120 marks out of 180 in the subject science. In which subject did the student perform better?
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Study Notes
Discount and Marked Price
- A discount of ₹208 is given on a shirt, reducing its price from the marked price to ₹1092.
Depreciation
- A scooter's value decreases by 8% per annum.
Percentage and Ratios
- A football team wins 40% of all matches played.
- If 24% of students are boys, and there are 456 girls, the total number of students can be calculated.
Simple Interest
- An amount of ₹12000 is borrowed at a rate of 6% per annum for 2 years.
- The difference in interest between simple and compound interest can be calculated.
Cost Price and Selling Price
- If the selling price is ₹34.40 and the gain is 7 ½ %, the cost price can be calculated.
Compound Interest
- The amount after 1½ years at 8% per annum compounded half-yearly is ₹62500.
- The bacteria count increases at 2.5% per hour.
- The amount and compound interest on a principal amount can be calculated.
Expenditure and Savings
- If a person spends 75% of their money and has ₹600 left, their initial amount can be calculated.
Performance Comparison
- A student's performance in two subjects can be compared using marks and percentages.
Population Growth
- The population of a place increases at 5% per annum.
Principal Amount and Compound Interest
- The amount and compound interest on a principal amount can be calculated.
Ratios and Conversions
- The ratio of 5 m to 20 km can be evaluated.
- Percentages can be expressed as decimals.
Discount and Marked Price
- The selling price of a water cooler can be calculated after an 18% discount.
- The marked price of a pair of skates can be calculated after a 20% discount.
Expenditure and Savings
- If a person spends 75% of their money and has ₹600 left, their initial amount can be calculated.
Percentage and Ratios
- Percentages can be expressed as decimals and fractions.
- A man's original salary can be calculated after a 10% increase.
Profit and Loss
- The gain or loss percentage made by a shopkeeper can be calculated.
Compound Interest
- The amount and compound interest on a principal amount can be calculated.
Business and Interest
- The amount credited against a person's name can be calculated after a certain period.
- The interest for the third year can be calculated.
Comparison of Interest
- The interest paid by two individuals can be compared and calculated.
Loan and Interest
- The amount to be paid to pay off a loan can be calculated.
Profit and Loss
- The gain percentage of a person selling oranges can be calculated.
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