Three successive discounts: find the single equivalent discount

The same question, asked 2 times: CDS 2 2017*, CDS 1 2021. Every wording below, oldest first.

Try each one first, then open its answer.

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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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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