<s>[INST] The regional sales manager at an auto dealership carefully monitors the number of cars sold at each of its three branches. After 4 months, the East Branch sold 280 cars. The West Branch had 20 more sales than the East Branch, so the West Branch sold 280 + 20 = 300 cars. The North Branch sold 40 more cars than the West Branch, so the North Branch sold 300+ 40 = 340 cars. Assuming the pattern continues and each branch sells cars at the same rate for the rest of the year, what is the total number of cars sold by all three branches in a year?[/INST]