Problem $1(5$ points$)$:

Write a simple script called spvol that calculates the volume of a hollow sphere, that is$,\frac{4}{3}(r_o^3-r_i^3),$

where $r_i=2$ is the inner radius, and $r_o=4$ is the outer radius. The script will prompt the user for the

inner and outer radii in the following format. Using these two variables, calculate the volume, and then

output the volume in the following format. Please pay attention to the number of decimal places in the

output.The inner radius is: $2$

The outer radius is: $4$

The volume of the sphere is: $234\mathrm{.}57$