What is the percentage change in the volume of a cylinder if its height increases by 20% and radius remains the same?

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Given here is a right circular cylinder, whose height increases by a given percentage, but radius remains constant. The task is to find the percentage increase in the volume of the cylinder.
Examples:

Input: x = 10 Output: 10% Input: x = 18.5 Output: 18.5%

Approach:

Let, the radius of the cylinder = r
height of the cylinder = h
given percentage increase = x%
so, old volume = π*r^2*h
new height = h + hx/100
new volume = π*r^2*(h + hx/100)
so, increase in volume = πr^2*(hx/100)
so percentage increase in volume = (πr^2*(hx/100))/(πr^2*(hx/100))*100 = x

#include <bits/stdc++.h>
using namespace std;
void newvol(double x)
{
    cout << "percentage increase "
         << "in the volume of the cylinder is "



         << x << "%" << endl;
}
int main()
{
    double x = 10;
    newvol(x);
    return 0;
}

import java.io.*;
class GFG
{
static void newvol(double x)
{
    System.out.print( "percentage increase "
        + "in the volume of the cylinder is "



        + x + "%" );
}
public static void main (String[] args)
{
    double x = 10;
    newvol(x);
}
}

def newvol(x):

print("percentage increase in the volume of the cylinder is ",x,"%")

x = 10.0

newvol(x)

using System;
class GFG
{
static void newvol(double x)
{
    Console.WriteLine( "percentage increase "
        + "in the volume of the cylinder is "
        + x + "%" );
}
public static void Main ()
{
    double x = 10;
    newvol(x);
}
}

<script>
function newvol(x)
{
    document.write( "percentage increase "
        + "in the volume of the cylinder is "
        + x + "%" );
}
var x = 10;
newvol(x);
</script>

Output:

percentage increase in the volume of the cylinder is 10.0%

Time Complexity: O(1), since there is no loop.

Auxiliary Space: O(1), since no extra space has been taken.