Answer:
$40
Step-by-step explanation:
Final sales value of total production: 
Product X = Pounds of raw material × Selling price 
= $1500 × 2 
= $3,000 
Product Y = Pounds of raw material × Selling price 
= $2,500 × 4 
= $10,000 
Product Z = $0 
Total = $13,000 
Net Realizable Value at split-off point: 
= Final sales value of product X + Final sales value of product Y 
= $3,000 + $ 10,000 
= $ 13,000 
Weighting : 
Product X = Final sales value of product X ÷ Net Realizable Value at split-off point 
= 3000 ÷ 13000 
= 0.23 
Product Y = Final sales value of product X ÷ Net Realizable Value at split-off point 
= 10,000 ÷ 13000 
= 0.77 
Product Z = 0 
Joint cost allocated: 
Product X = Weight of product X × Total cost 
= 0.23 × $ 5200 
= $ 1,196 
Product Y = Weight of product Y × Total cost 
= 0.77 × $ 5200 
= $ 4,004 
Allocated cost per pound : 
Product X = Joint cost allocated ÷ Pounds of raw material 
= 1,196 ÷ 1,500 
= $ 0.8/pound 
Product Y = Joint cost allocated ÷ Pounds of raw material 
= 4,004 ÷ 2,500 
= $ 1.6/pound 
Therefore, the value of ending inventory is as follows:
= Allocated cost per pound of product X × ending inventory of X
= $ 0.8/pound × 50
= $40