I believe that there are many friends who are business masters who don’t know how to upgrade the vehicles of business masters. Next, let the editor of Source Code.com edit "How to Upgrade Cars of Business Masters". For students who have questions in this regard, take a look at it. It may be able to help you. .
I have reached 25 red cars in the early and mid-term, but the level is not high. I am struggling with how to upgrade the car.
My suggestion is
If you want to stand firm in the mines, upgrade one fleet of vehicles and one fleet of vehicles.
If you want to greatly improve your strength, you can upgrade to an average of 25 red cars.
