Profit and Loss
 If cost of 15 eggs be 75 rupees, then find out the cost of 5 dozen eggs.

 300
 400
 500
 600

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Cost of one egg x 5 x 12
Correct Option: A
Cost of 15 eggs = 75 rupees
Cost of 1 egg = 75/15 = 5 rupees,
Cost of 5 dozens, i.e. 5 x 12 = 60 x 5 = 300
 A stationer buys diaries at 75 rupees per dozen and sells them at 15 rupees per piece. What is the profit?

 75
 100
 105
 110

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Each dozen carries cost 75 rupees and are sold for
12 x 15 = 180 rupeesCorrect Option: C
Each dozen carries cost 75 rupees and are sold for
12 x 15 = 180 rupees
profit = SPCP
profit = 18075 = 105 rupees
 A man bought 18 oranges for a rupee and sold them at 12 oranges for a rupee. what is the profit percentage ?

 33.33 %
 50 %
 66.66 %
 None of these

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From question CP/SP = 12/18 = 2/3
∴ Profit (%) = ( 3  2 ) / 2 x 100Correct Option: B
From question CP/SP = 12/18 = 2/3
∴ Profit (%) = ( 3  2 ) / 2 x 100 = 50%
2nd Solution:
CP = 100/18 = 5.55 paisa
SP = 100/12 = 8.33 paisa
∴ Profit = (8.335.55)/5.55 x 100 = 50 %
 On selling an article for Rs. 240, a trader loses 4%. In order to gain 10 % he must sell that article for

 Rs. 275
 Rs. 340
 Rs. 320
 Rs. 264

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Let the CP be Rs. x , then SP be 0.96x
∴ 0.96x = 240Correct Option: A
Let the CP be Rs. x , then SP be 0.96x
∴ 0.96x = 240
⇒ x = 250
Now the new SP = 250 X 1.1 = 275
 By selling 12 apples for a rupee, a man loses 20%. How many for a rupee should he sell to gain 20%

 8
 10
 15
 16

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SP = 100/12 paise
Let's CP = x
SP = 0.8x = 100/12
∴ x = 10/(0.8x12) paise
Therefore, CP = 100/9.6 paiseCorrect Option: A
SP = 100/12 paise
Let's CP = x
SP = 0.8x = 100/12
∴ x = 10/(0.8x12) paise
Therefore, CP = 100/9.6 paise
Thus the new SP (with 20% profit) = 100/9.6 X 1.2 = 100/8 paise
Hence, 8 apples can be purchased for Rs.1 to gain 20%