Data Sufficiency

At the beginning of last year, a car dealership had 150 cars in stock, which the dealership had purchased for $20,000 each. During the same year, the dealership made only one purchase of cars. What is the total amount spent by the dealership on the cars it had in stock at the end of last year?

1) Last year the dealership purchased 50 cars for $18,000 each.
2) Last year the total revenue from the sale of cars was $180,000.