2005年11月1日,刘芳与兰萍签订了一份《购销合同》。合同中约定:由刘芳从该月起连续8个月、于每月5日前分别向兰萍出售价值40万元的指定农产品,兰萍则必须在每月8日前向刘芳付清当月的货款;如果一方违约,每次必须向对方支付6万元违约金,对方还有权决定是否解除合同。2006年元月,兰萍因一时资金周转困难,直到28日仍未付清当月的货款。恰逢该类农产品的销 November 1, 2005, Liu Fang and Lan Ping signed a “sales contract.” The contract stipulates: Liu Fang from the month for eight consecutive months from the 5th before each month to sell the value of 40 million Lanping designated agricultural products, Lan Ping must be paid before the 8th of each month Liu Fang payment of the month's payment; If one party defaults, each must pay 60,000 yuan each other liquidated damages, the other party the right to decide whether to rescind the contract. January 2006, Lan Ping due to a temporary cash flow difficulties until the 28th, have not paid the purchase price of the month. Coincides with the sales of such agricultural products