I did read FAR 52.216-10(c), but the supplier is still only billing at the 13% billing fee rate. FAR 52.216-10(c) states that the Government can pay above this fee rate at the discretion of the contracting officer. I suppose my more specific question is, should I (as the contracting officer) pay above the amount being requested in the invoice or should I inform the supplier that the Government considers it appropriate for them to begin billing at a higher fee rate? Thanks!