Cameron Corp. started business in $2014$ and uses

the weighted average cost method. During $2014,$ it

purchased $45,000$ units of inventory at each and

sold $40,000$ units for each. In $2015,$ it purchased

another $50,000$ units at each and sold $45,000$

units at each.

Its $2015$ cost of sales $($in thousands$)$ was closest to:

a$)$

b$)491$

c$)$