The sales for​ October, November and December are​ $20,000, $22,000 and​ $28,000, respectively. For any particular month of​ sales, the following percentages are received over time in​ cash: 40% in cash from that same month of​ sales; 40% in cash from the previous​ month's sales;​ and, 20% in cash from the sales from two months ago. What amount of cash will be received during​ December?