Answer: $360
Explanation:
Given : The cost of 2 cases of printer paper = $ 48
∴ The cost of 1 case of printer paper = 

If each case contained 12 packages of paper. 
Then, then cost of 12 packages of printer paper= $24
∴ cost of 1 package of printer paper= 

Thus, the cost of 180 packages of printer paper=

Hence, the cost of 180 packages of printer paper= $360