The Turtle Society, a nongovernmental not-for-profit organization, receives numerous contributed hours from volunteers during its busy season. Chris, a clerk at the local tax collector's office, volunteered ten hours per week for 24 weeks transferring turtle food from the port to the turtle shelter. His rate of pay at the tax office is $10 per hour, and the prevailing wage rate for laborers is $6.50 per hour. What amount of contribution revenue should Turtle Society record for this service