General ACCALABOUR COSTS AND REMUNERATION METHODS

Employees are paid $7/hours fora standard 40 hours work . overtime is paid at time and one half. The employee is expected to make at least 120 units in a week l,and to encourage productivity, each in excess of 120 will generate an additional payment of $5 less any overtime premium that would relate to the time additional unit would normally take. what is an employee's wages in a week in which 135 units are made and the employee work 44 hours? Can anyone solve this with proves.