1.
Praveen purchases toffees at Rs. 10 per dozen and sells then at Rs. 12 for every 10 toffees: Find the gain(or) loss percentage.
• A.
52
• C.
41
• B.
36
• D.
44
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Explanation :
Cost Price = Rs. 10/12, Selling Price = Rs. 12/10
 SP CP
=
 144 100
= 1.44
So, profit percentage = 44 per cent
Alternative method:
Assume that he buys 120 toffees.
Praveen spends Rs. 100
Revenue generated = Rs. 144
Hence, profit percentage = 44 per cent
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2.
A trader purchased 15 articles. He sold some of them to a first customer at a gain of 4% and the remaining to another customer at a gain of 7%. If he gains 5% on the whole, how many articles did he sell to first customer?
• A.
7
• C.
10
• B.
9
• D.
13
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Explanation :
Let the trader have sold x articles to the first customer at 4% gain.
He sold (15 � x) articles to second customer at 7% gain
4% of x + 7% of (15 � x) = 5% of 15

x = 10
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3.
A manufacturer sells an article to a wholesale dealer at a profit of 20% and the wholesale dealer sells it to a retail merchant at a loss of 5%. Find the resultant profit or loss.
• A.
14% loss
• C.
12% gain
• B.
14% gain
• D.
None of these
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Explanation :
Here, m = -20, n = -5
Resultant profit or loss% =   m + n +
 mn 100

20 - 5 +
 20x - 5 100
= 14%
 Which represents profit as the sign is positive
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4.
Mr. Krishnan purchases eggs at the rate of Rs. 100 per gross and sells them at the rate of Rs. 75 per hundred. What is his profit percentage?
• A.
4%
• C.
1.8%
• B.
3.5
• D.
2
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Explanation :
Cost Price = Rs. 100 for 144 = Rs. (100/144) per egg
Selling Price = Rs. 75 for 100 = Rs. (75/100) each.
 SP CP
=
 75 100
=
 144 100
= 1.08
Hence, Profit percentage = 8%
This is also a fast approach to solving these problems.
Say if the SP is 0.98 times CP it implies that the loss is 2%
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5.
A machine is sold at a profit of 10%. Had it been sold for Rs 40 less, there would have been a loss of 10%. What was the cost price?
• A.
Rs 175
• C.
Rs 225
• B.
Rs 200
• D.
Rs 250
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Explanation :
Let the C.P. be Rs k
S.P. = k + 10% of k =
 11k 10

k - 10% of k =
 11k 10
- 40

 9k 10
=
 11k 10
- 40

 2k 10
= 40
k = 200
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