On or before the last business day of the month following the close of each calendar month, (a) Assignor shall deliver to Assignee a statement showing, in reasonable detail, the balance of the Net Revenue Account as of the end of such calendar month, and (b) Assignor shall pay to Assignee an amount equal to 12.50% of the Net Revenue, if any, for such calendar month (the “Production Payment” ). Assignee and its representatives shall have the right to audit the Net Revenue Account and records relating to the Net Revenue Account upon request, such request not to be made more than once annually, to be performed at the sole cost and expense of Assignee, except as provided below. Upon such a request, Assignor shall make available to Assignee or its designated representative all records of account and supporting documentation within thirty (30) days. Assignee may specify the time period for such audit, not to exceed twenty-four (24) months. In the event the Assignee finds any discrepancy of more than 5% in the amount of proceeds paid to Assignee and the amount of proceeds which were due to Assignee, the Assignor shall pay all of the costs and expenses of the audit. The Assignor shall promptly pay the amount of any deficiency in the proceeds paid to the Assignee hereunder which are discovered as a result of any audit, from the date originally due.