Al Maha company produces 600 units in a ten-hour day by 2 workers who use 400 kilos of raw materials. Each Worker is paid 5 Omani Rials per hour, raw material cost is 0.5 Rial per kilo. The overhead cost is 60 Omani Rials Calculate the labor productivity measured in units per Rial O a. 6,0 O b. None is correct c. 1.67 d. 2.5 O e 4.0