Goryeo Company uses the periodic inventory system. Sales for 2020 were $200,000 while operating expenses were $50,000. Beginning and ending inventories for 2013 were $30,000 and $20,000, respectively. Net purchases were $100,000 while freight in was $10,000. The net income or loss for 2013 was: $30,000 net income O $20,000 net income O $60,000 net income O $20,000 net loss