China Knowledge reported that Daimler AG's luxury car unit Mercedes-Benz unit sold 15,860 vehicles in China in April this year reflecting a YoY decrease of 8%. In the first four months of this year, the company delivered a record 70,580 units of Mercedes-Benz, Smart, AMG and Maybach in China upb y 15%YoY. Last month, the sales of Smart model were 1,434 units, taking the total sales in the first four months…