Answer and Explanation: 
 As per the data given in the question, 
a) 
 Music World Retail 
 Partial Income Statement 
 For year ended Dec-31,2017 
Cost of goods sold : 
Beginning merchandise inventory $200,000 
Add: Cost of purchase $300,000 
Goods available for sale $500,000 
Less: Ending merchandise inventory $175,000 
Cost of goods sold $325,000 
 
b) 
 Wave Board Manufacturing 
 Partial Income Statement 
 For year ended Dec-31,2017 
Cost of goods sold : 
Beginning finished goods inventory $500,000 
Add: Cost of goods manufacture $875,000 
Goods available for sale $1,375,000 
Less: Ending finished inventory $$225,000 
Cost of goods sold $1,150,000
We simply applied the above format