In May,Xiang sold 15 used cars.For these 15 cars,the range of the selling prices was $15,000 and the lowest selling price was $4,500.In June,Xiang sold 10 used cars .For these 10 cars,the range of the selling prices was 16,500 and the lowest selling price was $ 6,100.What was the range of the selling prices of the 25 used cars sold by Xiang in May and June?
18100
how to get it??What is the range? | 
