and then answer the questions below.

When the weighted average cost method is used in a perpetual inventory system, a weighted average unit cost for each item is computed

a$.$ each time a sale is made.

b$.$ at the end of the year.

c$.$ at the beginning of each month.

d$.>$ each time a purchase is made.

$$ the inventory at June $17$ after the sale?

a$.$ $$140$

b$.$ $$160$

c$.$ $$210$

d$.$ $$380$