The following pie chart shows the monthly sale of laptops of 5 companies A,B,C,D,E in a store.
If 2,500 laptops were sold by the store in a month, then what is the difference between the number of laptops sold of Company A and that of Company C?
If \(
a + \frac{1}{a} = 7,
\) then \(
a^{5} + \frac{1}{a^{5}}
\) is equal to: