Beginning inventory, purchases, and sales data for tennis rackets are as follows: April \begin{aligned} 3 & Inventory & 19 units @ & \( \$ 12 \\ 11 & \) Purchase & 17 units @ & \( \$ 16 \\ 14 & \) Sale & 21 units & \\ 21 & Purchase & 9 units \( @ & \$ 22 \\ 25 & \) Sale & 11 units & \end{aligned}