Percentage change in volume when dimensions change by given percentages

This type of question, asked 2 times: CDS 1 2017, CDS 1 2024. All 2 questions below, oldest first.

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Question 1
CDS 1 2017
82 $If the radius of a right circular cone is increased by p% without increasing its height, then what is the percentage increase in the volume of the cone ?$
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Question 2
CDS 1 2024
56 $The length, breadth and height of a cuboid are increased by 10%, 20% and 50% respectively. What is the percentage increase in volume of the cuboid ?$
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