Hyundai Motor Co., South Korea's leading automaker, and its smaller affiliate Kia Motors Corp. posted a 10 percent rise in their sales in China in the first four months of the year, driven by rising demand for their small passenger cars and sport utility vehicles (SUVs), industry data showed Sunday. The two South Korean automakers sold a combined 582,890 units in the neighboring country in the January-April period, up 10.1 percent from a year earlier, according to the data.