$15.75
First we need to calculate how much the company charges in insurance. 5% is the same as 0.05, so we multiply $15 by 0.05 to find the 5% of the package cost it takes to insure the package. This gets us $0.75. We then have to add this new insurance price of $0.75 to the initial shipping cost of $15 to get the total cost to ship this item. This gets us a total of $15.75.
$15 x 0.05 = $0.75
$15 + $0.75 = $15.75