融信中国5月合约销售额4.379亿元人民币，1-5月累计合约销售额18.6亿元人民币。

Group 1 - The core point of the article is that Rongxin China reported a contract sales amount of 437.9 million RMB in May, with a cumulative contract sales amount of 1.86 billion RMB from January to May [1] Group 2 - In May, the contract sales amount of Rongxin China was 437.9 million RMB [1] - The cumulative contract sales from January to May reached 1.86 billion RMB [1]