Simple spreadsheet wanted

A straightforward spreadsheet is required to create a training course for students.

The spreadsheet should allow for editing of variables, displaying the resulting final figures, and calculating the total income and expenditure.

The variables include the number of courses, the number of students per course, the price charged per course, the cost of office, location, and instructors, and the number of instructors.

The spreadsheet should calculate the total income from the courses, the total expenditure, and the net profit.

1) Number of courses,
2) Number of students per course,
3) Price charged per course,
A) Show total income from 1, 2 & 3
4) Cost of office,
5) Cost of location,
6) Cost per instructor
7) Number of instructors,
B) Show total expenditure of 4, 5, 6, & 7
Show total of income from A, minus total of expenditure of B

As mentioned, I need to be able to change items 1-7 and see the result each change makes to my bottom line. That's it, I think, but maybe you have a better way to display this.

I need this started and completed immediately, so whoever can start and complete fastest I will most likely pick, depending on your expertise.

Thank you