During a year, Marks monthly sales compensation ranged between $22,000 and $30,000 per month and units sold ranged between 1,400 and 2,200 units for those same months.

Required:

Use the highlow method to determine Marks monthly salary and commission rate per unit sold and then calculate the total number of units sold in a year when Marks total compensation amounted to $291,000. (Round your "Commission rate" to 2 decimal places.)