A batch of commodities is priced at a profit margin of 30%. After selling 70%, in order to sell out as soon as possible, the rest will be sold at half of the price. What is the profit margin after the sale?
一批商品，按30%的利润率定价．卖出70%后，为了尽快售完，剩下的全部按定价的一半出售，销售完后获得的利润率是多少．
<result>0.105</result>