During the last month of June 2021, the total units produced by each employee in the Gulf Mushroom are given below. Employee Name No of Units Mohammed 400 Kareem 325 Sohar Heater LLC pays workers as follows: No of Units produced Rate per Unit 1 - 50 Units OMR 2.5 51 - 200 Units OMR 3.5 201 - 300 Units OMR 4.5 301 - 500 Units OMR 5.5 Above 500 Units OMR 6.5 Find the gross earnings of Kareem