Xiaokai opened a car wash shop, which used to have decent business, but due to the soaring prices this year, the water, electricity, and labor costs have increased, resulting in very little profit for the car wash shop. As the saying goes, "All the hustle and bustle in the world is for profit, and all the bustle is for profit." Xiao Zhang worries about the business of the car wash shop every day. He has to pay wages and rent to several workers every month for so much water and electricity bills. The meager profit is really difficult to sustain. Now, only by reducing costs and increasing the number of cars washed every day can business improve. So, what methods can he use to increase revenue and reduce expenses?

One day, Xiao Zhang accidentally came across a fully automatic car wash machine online. He was so excited that he couldn't find it without putting in any effort. He was as excited as Columbus when he discovered the American continent, and finally found his savior, which was this fully automatic car wash machine. The operation of a fully automatic car washing machine is very simple. As long as the driver turns off the engine and releases the handbrake, the car can be parked in a fixed position without moving. The car washing equipment will move back and forth according to the vehicle model, automatically washing the chassis, spraying computerized car washing machine with car washing liquid and water wax, automatic imitation brushing, and automatic imitation air drying. A dirty car goes in and a clean car comes out, and the washing time is generally about 3 minutes.