The S car in Tiantian Speed is the car that everyone dreams of and is also the highest-level car in the game. Many players are looking at their wallets and thinking about the funding of upgrading to Car A to Car S. So how much does it cost?

　　How much does it cost to drive a car to a car every day:

　　Class car upgraded to B-class car is 5,000 gold coins, but B-class car upgraded to A-class car becomes 60,000 gold coins. So it is inferred that it takes at least 10W for car A to evolve into a car S.