Kevin is an auto mechanic. He spends 3 hours when he replaces the shocks on a car and 2 hours when he replaces the brakes. He works no more than 36 hours a week. He routinely completes at least 2 shocks replacements and 3 brake replacements a week. If he charges ​$400 for labor replacing shocks and ​$200 in labor for replacing​ brakes, how many jobs of each type should he complete a week to maximize his​ income?