Spends 25% on food, 15% rent, 10% clothing, saves Rs. 3000. Income: MCQ with Answer and Explanation
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Question #1
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The price of a rare artifact was increased by r%. Later, the new price was decreased by r%. If the final price of the artifact is Rs. 1, what was its original price in Rs.?
Correct Answer: Option C
Explanation:
Let original price be P. P * (1 + r/100) * (1 - r/100) = 1. P * (1 - r^2/10000) = 1. P * ((10000 - r^2) / 10000) = 1. P = 10000 / (10000 - r^2).
Let original price be P. P * (1 + r/100) * (1 - r/100) = 1. P * (1 - r^2/10000) = 1. P * ((10000 - r^2) / 10000) = 1. P = 10000 / (10000 - r^2).
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Maths
Percentage
Question #2
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If the numerator of a fraction is increased by 50% and denominator decreased by 25%, the fraction becomes 3/2. Original fraction:
Correct Answer: Option D
Explanation:
(1.5a)/(0.75b) = 2a/b = 3/2 → a/b = 3/4.
(1.5a)/(0.75b) = 2a/b = 3/2 → a/b = 3/4.
This question belongs to:
Maths
Percentage
Question #3
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30% of 150 + 20% of 50 = ?
Correct Answer: Option D
Explanation:
30% of 150 = 45, 20% of 50 = 10, sum = 55.
30% of 150 = 45, 20% of 50 = 10, sum = 55.
This question belongs to:
Maths
Percentage
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