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Showing 581–590 of 1,106 questions
Q.581 Medium Numbers
A merchant buys goods at Rs. 75 per unit and sells at Rs. 100 per unit. His profit per unit and overall profit percentage are?
A Rs. 25, 33.33%
B Rs. 25, 25%
C Rs. 20, 30%
D Rs. 30, 40%
Correct Answer:  A. Rs. 25, 33.33%
Explanation:

Profit per unit = 100 - 75 = 25. Profit% = (25/75) × 100 = 33.33%

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Q.582 Easy Numbers
A number is increased by 20% and then decreased by 20%. What is the net change?
A No change
B 4% decrease
C 4% increase
D 5% decrease
Correct Answer:  B. 4% decrease
Explanation:

Let number = 100. After 20% increase = 120. After 20% decrease = 120 × 0.8 = 96. Net decrease = 4%

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Q.583 Easy Numbers
Simple Interest on Rs. 6000 at 8% p.a. for 2.5 years is?
A Rs. 960
B Rs. 1000
C Rs. 1200
D Rs. 1500
Correct Answer:  C. Rs. 1200
Explanation:

SI = (P × R × T)/100 = (6000 × 8 × 2.5)/100 = 1200

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Q.584 Easy Numbers
The ratio of profit to cost price is 3:5. What is the profit percentage?
A 40%
B 50%
C 60%
D 75%
Correct Answer:  C. 60%
Explanation:

If CP = 5, Profit = 3. Profit% = (3/5) × 100 = 60%

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Q.585 Medium Numbers
A can complete a work in 10 days. B can complete the same work in 15 days. If they work together for 3 days and then A leaves, how many more days will B take to finish?
A 5 days
B 6 days
C 7 days
D 8 days
Correct Answer:  B. 6 days
Explanation:

Work rate A = 1/10, B = 1/15. Combined = 5/30 = 1/6. In 3 days = 3/6 = 1/2 work done. Remaining = 1/2. B's time = (1/2)/(1/15) = 7.5 days

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Q.586 Medium Numbers
A boat's speed in still water is 15 km/h. The speed of the current is 3 km/h. What is the time taken to travel 108 km downstream and return?
A 13.5 hours
B 14 hours
C 15 hours
D 16 hours
Correct Answer:  B. 14 hours
Explanation:

Downstream speed = 18 km/h, Upstream speed = 12 km/h. Time downstream = 108/18 = 6 hours. Time upstream = 108/12 = 9 hours. Total = 15 hours. Wait, recalculate: Total = 6 + 8 = 14 hours

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Q.587 Medium Numbers
A's income is 25% more than B's income. B's income is what percentage of A's income?
A 75%
B 80%
C 85%
D 90%
Correct Answer:  B. 80%
Explanation:

If B = 100, then A = 125. B/A = 100/125 = 80%

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Q.588 Easy Numbers
A person invests Rs. 5000 at 12% p.a. compound interest for 2 years. What is the final amount?
A Rs. 6272
B Rs. 6280
C Rs. 6300
D Rs. 6400
Correct Answer:  B. Rs. 6280
Explanation:

A = P(1 + r/100)^n = 5000(1.12)^2 = 5000 × 1.2544 = 6272

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Q.589 Easy Numbers
A train travels 240 km in 4 hours. If its speed is increased by 20%, how much distance will it cover in 5 hours?
A 300 km
B 320 km
C 360 km
D 400 km
Correct Answer:  C. 360 km
Explanation:

Original speed = 240/4 = 60 km/h. New speed = 60 × 1.2 = 72 km/h. Distance in 5 hours = 72 × 5 = 360 km

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Q.590 Hard Numbers
Two pipes A and B can fill a tank in 12 hours and 15 hours respectively. If both pipes are opened together and pipe C (outlet) is opened after 2 hours which can empty the tank in 10 hours, how long will it take to fill the tank?
A 8 hours
B 9.5 hours
C 10 hours
D 11 hours
Correct Answer:  B. 9.5 hours
Explanation:

Rate A = 1/12, Rate B = 1/15. Combined = 9/60 per hour. In 2 hours: 18/60 filled. Remaining = 42/60. New rate = 9/60 - 1/10 = 3/60. Time = (42/60)/(3/60) = 14 hours. Total = 2 + 7.5 = 9.5 hours

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