Assume the following information:

April $1$ Beginning Inventory $4$ units at cost of $$15$

April $10$ purchase $6$ units at cost of $$15$

April $12$ sale $,7$ units

Using the perpetual inventory system, what is the amount of Cost of Goods Sold?

A$.$ $$45$

B$.$ $$105$

C$.$ $$150$

D$.$ $$15$