水果种类,1月销售量,2月销售量,3月销售量,1季度销售额
苹果,200,180,300,$20,000
香蕉,300,350,400,$23,000
橙子,150,200,180,$12,000
葡萄,120,90,100,$8,000
草莓,80,100,120,$6,000
樱桃,50,70,80,$4,500
菠萝,60,80,100,$6,500
柠檬,90,110,120,$7,500
基于以上表格，苹果1季度累计销售量多少？