Percentage


  1. 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


  1. 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(1-8%) = 0.92%
    Given, 1.08%-0.92% = Rs12
    0.16x = Rs.12
    ⇒x = Rs.75



  1. 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


  1. 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%



  1. 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