1. Ahmed Enterprises had an opening balance of office supplies equal to OMR 1,000 and the office supplies bought during 2017 is OMR 3,000. At the end of the accounting period, the remaining supplies is only OMR 500. How much is the used supplies at the end of the accounting period? (1 Mark) OMR 3,000 OMR 4,000 OMR 4,500 OMR 3,500