At the beginning of August, Mullin Athletics had a $0 balance in Accounts Receivable. In the month of August, they signed three contracts with schools to provide athletic apparel: 1: Provide 150 football uniforms at a selling price of $75 each and a cost of $40 each, delivered on August 12. 2: Provide 150 football uniforms at a selling price of $75 each and a cost of $40 each delivered on August 14, and 36 basketball uniforms at a selling price of $60 each and a cost of $30 each delivered on October 1. 3: Provide 50 basketball uniforms and 50 track uniforms; 50 basketball uniforms at a selling price of $60 each and a cost of $30 each delivered on October 4, 50 track uniforms yet to be delivered with a selling price of $50 and a cost of $25. Assuming they have not yet received payment for any of the uniforms, what is the December 31 ending balance in Mullin Athletics Accounts Receivable account