A young car mechanic is considering opening his own auto repair shop. To do so, he would have to quit his current job, which pays $30,000 a year, and take over a store building that he owns and currently rents to his uncle for $7,000 a year. His expenses at the auto repair shop would be $30,000 for parts, $2,000 for taxes, and $3,000 for utility. What is the total amount of his explicit costs?