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%?
    1. 2400
    2. 2500
    3. 2600
    4. 2000

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    SP - CP = 480

    Correct Option: A

    SP - CP = 480
    1.2x - x = 480
    ⇒0.2x = 480
    ⇒x = 2400


  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?
    1. 72
    2. 70
    3. 80
    4. 75

  1. View Hint View Answer Discuss in Forum

    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?
    1. 60cc
    2. 80cc
    3. 75cc
    4. 70cc

  1. View Hint View Answer Discuss in Forum

    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?
    1. 20%
    2. 30%
    3. 25%
    4. 40%

  1. View Hint View Answer Discuss in Forum

    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?
    1. 42
    2. 45
    3. 48
    4. 40

  1. View Hint View Answer Discuss in Forum

    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