Docherty,Inc The Operating Income Calculated Using Variable Costing and Absorption Costing

Docherty,Inc.reports the following information for the year ended December 31: $$\begin{array} { | l | r | l | } \hline \text { Units sold } & 600 & \text { units } \\\hline \text { Sales price } & \$ 120 & \text { per unit } \\\hline \text { Direct materials } & \$ 29 & \text { per unit } \\\hline \text { Direct labor } & \$ 8 & \text { per unit } \\\hline \text { Variable manufacturing overhead } & \$ 13 & \text { per unit } \\\hline \text { Fixed manufacturing overhead } & \$ 25 & \text { per unit } \\\hline \text { Variable selling and administrative costs } & \$ 5 & \text { per unit } \\\hline \text { Fixed selling and administrative costs } & \$ 14,500 & \text { per year } \\\hline\end{array}$$ The operating income calculated using variable costing and absorption costing amounted to $9800 and $11,000,respectively.There were no beginning inventories.Determine the total number of units produced during the year.

A) 600 units
B) 648 units
C) 10 units
D) 48 units