Bell Tower Manufacturing Inc. Incurred the following costs in 2015:

Total product costs incurred- $300000

Total period costs incurred- $ 100000

30,000 units were produced during the year of which 25,000 units were sold for $32 each. There was no beginning or ending work-in- process inventory.

What was Bell Tower's net income for 2015(ignore taxes)?

a) $550,000

b) $500,000

c) $400,000

d) $450,000