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Series of successive discounts and the single equivalent discount

This type of question, asked 3 times: CDS 2 2017, CDS 1 2021, CDS 1 2026. All 3 questions below, oldest first.

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  1. Question 1

    CDS 2 2017

    10
    Sudhir purchased a chair with three consecutive discounts of 20%, 12.5% and 5%. The actual deduction will be

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  2. Question 2

    CDS 1 2021

    31
    A trader gives successive discounts of 20%, 10% and 5% respectively. What is the overall discount?

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  3. Question 3

    CDS 1 2026

    33
    A single discount which is equivalent to a series of discounts p%p\%, p2%\frac{p}{2}\%, p4%\frac{p}{4}\% is 31.6%. What is the value of p ?

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