Any barter arrangement must be agreed to prior to commencement of work. In cases where HTC has agreed to perform services for barter, HTC will accept no more than 25% barter (remainder in cash) for work done from June 1 through August 30 and/or November 1 through December 31. Barter will not be accepted for services performed January 1 through May 31 or September 1 through October 31.