Write a script file that solves the following problems:

1. Find the volume of a sphere that has a radius of 9m.

2. Find the area of a square that has a length of 4m.

3. Find the amount of tax paid on a purchase of $120.66 if the tax rate is 6%.

4. Find the interest paid per year on a 5 year car loan of $20,000 if the interest rate is 2%.

5. Find the volume of a cube with sides that are 5m.

Scripting Language : Python