In May, Xiang sold 15 used cars. For these 15 cars, the range of the selling price 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 $6,500. What was the range of the selling prices of the 25 used cars sold by Xiang in May and June?  Choose the correct choice from the following answers:
A) 1. $15,600  B) 2. $15,750  C) 3. $16,820  D) 4. $18,500  E) 5. $19,200
Edited the question as there was a typo.   Range = Highest Value - Lowest Value.   Range in May was 15,000 and the lowest price in May was 4,500, thus the highest price in May was 15,000+4,500=19,500.   Range in June was 16,500 and the lowest price in June was 6,500, thus the highest price in June was 16,500+6,500=23,000.   Lowest price of a car in May-June was 4,500 (May) and the highest price of a car in May-June was 23,000, thus the range for May-June is 23,000-4,500=18,500.   Answer: 4. $18,500.
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In May, Xiang sold 15 used cars. For these 15 cars, the range of the selling price 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 $6,500. What was the range of the selling prices of the 25 used cars sold by Xiang in May and June?