A good little feature that makes excel do the work for you.
Using your cursor select and highlight all the sums you want to be calculated.
Then press the autosum buttom which is located under your window tools buttom. ( M on its side )
Simple as that. All yourlculations are done for you.
It is okey but as it is a website ,you need to put other pages like :contact, and FAQ etc…,you have to make the text BOLD, so that it will be readable by those who have eyes problem.