During a year, Teri's monthly sales compensation ranged between $13,000 and $17, 400 per month and units sold ranged between 1, 100 and 1, 900 units for those same months. Required: 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 $141, 150. (Round your "Commission rate" to 2 decimal places.)