The Lot Size Is 60 Units and the Units on Hand

The lot size is 60 units and the units on hand are 0 units.What is the total cost when using an average inventory value? The holding cost is $3 per unit per period and the ordering cost is $500 per order.No lead time exists.
$$\begin{array} { | c | c | c | c | c | c | c | c | c | } \hline \begin{array} { c } \text { Lot } \\\text { size: } \\60 \mathrm { x }\end{array} & { \text { Period } } \\\hline & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\\hline \text { GR } & 80 & 90 & 125 & 290 & 125 & 80 & 45 & 60 \\\hline \text { SR } & & 150 & & 60 & & & & \\\hline \text { POH } & & & & & & & & \\\hline \text { NR } & & & & & & & & \\\hline \text { POR } & & & & & & & & \\\hline\end{array}$$