During a year, Teri's monthly sales compensation ranged between $15,000 and $20,200 per month and units sold ranged between 1,000 and 1,800 units for those same months. Use the high-low method to determine Teri's monthly salary and commission rate per unit sold and then calculate the total number of units sold in a year when Teri's total compensation amounted to $183,250. (Round your "Commission rate" to 2 decimal places.)