From here you can hire a new Mechanic. Each Mechanich have a precise set of skills and can take care of a specific maintenance type. Furthermore, they have a speed which means a decrease of 5% for each speed point in maintenance time
Salaries are calculated based on the settings you choose and based on previous 7 days from now (for Percentage on Revenue and Reward per KM salary types). The amount calculated now could be not the same calculated on next Monday.