Sheffield Company had a beginning inventory on January $1$ of $160$ units of Product $4-18-15$ at a cost of $$20$ per unit. During the year, purchases were as follows. Mar. $15$ July $20400$ units $220$ units at at $$24$ $$28$ Sept. $4$ Dec. $2300$ units $100$ units at $$33$ $$30$ at Sheridan Company uses a periodic inventory system. Sales totaled $975$ units. Sheridan Company had a beginning inventory on January $1$ of $160$ units of Product $\backslash (4-18-15\backslash )$ at a cost of $\backslash (\backslash$$ $20\backslash )$ per unit. During the year. purchases were as follows. Sheridan Company uses a periodic inventory system. Sales totaled $975$ units.