In addition to the unit price for reserved bandwidth, you can specify a cancellation fee. This fee is expressed as a percentage: the fee is that percentage times the remaining time on the reservation. If the reservation is cancelled, this percentage of the value of the cancelled portion of the reservation is charged to the buyer. For example, if the cancellation fee is 50% and the buyer cancels the last quarter of the contract, the buyer owes 25% of the original contract price (the remaining portion of the contract) times 50% (the cancellation fee), or 12.5% of the original contract price. Buyers are informed of this fee in a pop-up confirmation window when they ask to cancel a reservation.