A company rents diving equipment for a fixed amount plus a fee based on the number of days for which the equipment is rented. The table below shows the total charges, y, in dollars, of renting diving equipment for x number of days:

Number of Days(x) | Total Charges (dollars)(y)
0 | 5
1 | 20
2 | 35

What is the fixed amount charged?

$2
$5
$15
$20