Mia Corporation consigned 4,800 medical equipment costing $90 and retaling for $3,000 each to Andres Company. Freight cost of $4,800 was paid as freight expenses by the consignor. After a month, Mia received $213,030 in full settlement of the balance due. The consignor deducted a commission of $600 for each equipment sold, $270 for delivery expense and $300 for advertising expense. How many medical equipment were sold?