Calculate Variable Overhead Expenditure Variance using the given information: Budget Actual Units of Output 8,000 9,000 Overhead: OMR 5,000 Fixed Variable Hours OMR 4,500 OMR 5,000 OMR 4,000 2,000 2,300 a. OMR 1,750A b. OMR 1,750F C. OMR 500F d. OMR 500A