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Q1. If a sum of money at simple interest becomes doubled in 8 years, in how many years will it become fourfold?
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Q2. A car travels from city A to city B at 40 km/h and returns at 60 km/h. If it took 2 hours less for the return journey than the onward journey, what is the distance between the cities?
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Q3. If 20% of x is 10, then x is:
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Q4. What is 62.5% expressed as a decimal?
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Q5. If a number is increased by 10% and then by 20%, what is the overall percentage increase?
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Q6. What is 175% as a mixed fraction?
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Q7. A person walks at 80% of their usual speed and reaches their destination 15 minutes late. If they had walked at 60% of their usual speed, how much longer would they have taken compared to the first delayed arrival?
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Q8. A man spends 30% of his income on rent and 20% of the remaining on food. If he saves Rs. 7500, what is his total income?
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Q9. If the cost price of an article is 75% of its marked price, then the percentage of discount is:
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Q10. If 25% of a number is 100, what is 75% of that number?
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Q11. The marked price of a refrigerator is 50% above the cost price. The shopkeeper sells it at a discount of 20% on the marked price. If he makes a profit of Rs. 400, what is the cost price?
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Q12. The price of a fan is reduced by 20%. By what percentage must the new price be increased to restore the original price?
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Q13. What is 3/5 as a percentage?
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Q14. If 30% of a number is 120, then 50% of that number will be:
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Q15. If 60% of a number is 48, then what is 30% of that number?
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Q16. The mean of 5 observations is 12. If one observation is added, the new mean becomes 14. What is the added observation?
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Q17. What is the conjugate of 5 + 2i?
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Q18. What is 20% of 50?
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Q19. What is the value of 1 - sin²(θ)?
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Q20. What is 20% of 150?
