During a year, Tractor's monthly sales compensation varied between $17,000 and $23,000 per month and units sold ranged between 1,400 and 2,200 units for those same months.

Required:

Use the highlow method to determine Tractor's monthly salary and commission rate per unit sold and then calculate the total number of units sold in a year when Tractor's total compensation amounted to $186,750. (Round your "Commission rate" to 2 decimal places.)