Another common mathematical operation would be to find the average of the two salaries. Let's start by adding comment 10 as follows:

//10. totalSalary is a computed variable or calculated variable

What this means is that the value of `totalSalary` is the result of a calculation on the right side of the equals, so it's called a computed or calculated variable.

Next, we'll find an average. So, because `totalSalary` has already been created and its value has been set, we can use it in code that comes below that line:

decimal averageSalary = totalSalary / 2;

We start with `decimal averageSalary =`. To find an average of two quantities, you normally add them together and divide by two. However, it's a good idea to avoid using ...