The annual appropriation to the office of legislative services from the general fund shall provide for authorized audits and services to general fund departments, agencies, commissions, or institutions without charge to the unit receiving such services. The cost and expenses incurred by the legislative services office in conducting audits or in carrying out other work authorized by law in dedicated funds, shall be paid from the appropriation to the office, department, board, commission, or institution and/or the dedicated funds under the control of the office, department, board, commission, or institution for whom the work is done. The audit fee or costs of work performed in such dedicated fund agencies shall be based on an hourly rate computed by the legislative services office and shall be sufficient to defray all costs and expenses incurred, including but not limited to related salary, travel and office overhead expenses. The legislative services office may require partial payments, during the course of the audit, for services rendered and expenses incurred. All charges shall be paid within thirty (30) days after billing is received.