On increasing the radius of a sphere by `10%,` find the percentage increase in its volume.

Explanation

To solve the problem of finding the percentage increase in the volume of a sphere when its radius is increased by 10%, we can follow these steps:

### Step-by-Step Solution:

1. **Define the Original Radius**:
Let the original radius of the sphere be \( r \).

2. **Calculate the Original Volume**:
...