Spends 15% rent, 10% food, 20% education, 25% others, saves Rs. 15000. Salary: MCQ with Answer and Explanation
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Question #1
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In a school, 60% are boys and 40% are girls. If 50% of the boys and 60% of the girls are absent, what percent of the total students are present?
Correct Answer: Option D
Explanation:
Total = 100. Boys=60, girls=40. Absent boys=30, absent girls=24, total absent=54. Present = 46%.
Total = 100. Boys=60, girls=40. Absent boys=30, absent girls=24, total absent=54. Present = 46%.
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Maths
Percentage
Question #2
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The price of an article increases by 10%, and then again by 10%. What is the net percentage increase?
Correct Answer: Option A
Explanation:
Successive percentage formula: a + b + (ab / 100). 10 + 10 + (10 * 10 / 100) = 20 + 1 = 21%.
Successive percentage formula: a + b + (ab / 100). 10 + 10 + (10 * 10 / 100) = 20 + 1 = 21%.
This question belongs to:
Maths
Percentage
Question #3
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A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation?
Correct Answer: Option B
Explanation:
True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.
True value = 5/3x. False value = 3/5x. Error = (5/3 - 3/5)x = (16/15)x. % Error = ((16/15) / (5/3)) * 100 = (16/25) * 100 = 64%.
This question belongs to:
Maths
Percentage
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