During a year, Marks monthly sales compensation ranged between $21,000 and $28,600 per month and units sold ranged between 1,200 and 2,000 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 $290,950.

\begin{tabular}{|l|rr|l|} \hline Monthly salary & $ & 9,600 & \\ \hline Commission rate & 9.50 & per unit \\ \hline Total number of units sold & & \\ \hline \end{tabular}