In his first month of operations, Pharoah Company made three purchases of merchandise in the following sequence: $(1)650$ units at $$6,(2)750$ units at $(3)850$ units at $$9.$ Pharoah uses a periodic invetory system.

Calculate weighted$-$average unit cost.

Weighted$-$average unit cost $

Compute the cost of the ending inventory under the average$-$cost method, assuming there are $550$ units on hand at the end of the period.

Cost of the ending inventory $