Percentage
 The selling price and cost price of an article differs by 480. What is the selling price in case the profit percentage is 20%?

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SP  CP = 480
Correct Option: B
SP  CP = 480
1.2x  x = 480
⇒0.2x = 480
⇒x = 2400
So selling price SP = 2400 + 480 = 2880
 If a person sells a wooden furniture at 8% profit against 8% loss, then he could had earned Rs12 more. What is the cost price of furniture?

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SP at Profit  SP at loss = Rs 12
Correct Option: D
Let Cost Price (CP) = x
Then Selling Price(SP) if he sells at profit = x(1+8%) = 1.08x
and SP, if he sells at loss = x(18%) = 0.92%
Given, 1.08%0.92% = Rs12
0.16x = Rs.12
⇒x = Rs.75
 Calculate the amount of water which should be added to 80% solution of Sulphuric acid to make it a 50% solution?

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Assume as x be the amount of water added to make concentration of 50%
Correct Option: A
Concentration of Sulphuric acid = 80%
So in a 100cc, Sulphuric acid = 80cc and water = 20cc
Let x be the amount of water added to make concentration of 50%
⇒80/(100+x) = 50/100
⇒ 80/(100+x) = 1/2
∴ x = 60cc
 An metallic alloy contains 20g copper, 20g tin and 40g silver.Then find out the percentage of tin in the alloy?

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Percentage of silver = weight of silver/ weight of alloy
Correct Option: C
Total weight of alloy = 20+20+ 40 = 80g
Weight of tin = 20g
Percentage of tin = 20g/80g x 100
=25%
 If the price of petrol is increased by 20% and subsequently by 40%. If the original price was Rs25 per litre then what is then the final price per litre?

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Final price = Initial price x (1 + 1st increase in percent) x (1 + 2nd increase in percent)
Correct Option: A
Final Price = 25 x (1 + 20/100) x (1 + 40/100)
=Rs.25 x 1.2 x 1.4
= Rs. 42