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

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  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
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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

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  1. A marketing manager is able to manage an average of Rs240 per week during 40h week . But in the final week of the month, his rates are increased by 50%. Then find out the commission the marketing manager makes in that week, if he puts in 60h during that final week?
    1. 500
    2. 540
    3. 520
    4. 600
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    Total commission = New rate after increase x Total hours in the week.

    Correct Option: B

    Average rate per hr = 240/40 = Rs6/hr
    In last week, his rate per hour increases by 50%,
    so in the last week, his hourly rate = Rs.6 x (1+50%)= Rs.9
    Total hour spent in final week = 60h
    ∴ Total commission = 60h x Rs.9/hr = Rs.540

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  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
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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

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  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%
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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%

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