Scenario: an Economy Produces Only Cell Phones

Scenario: An economy produces only cell phones. In 2015, the economy manufactured 275 cell phones, and each cell phone sold for $200. In 2016, the economy manufactured 280 cell phones, but the price of each cell phone fell to $180.
-Refer to the scenario above.Using 2015 as the base year,what was the real GDP of the economy in 2015?

A) $45,000
B) $55,000
C) $57,500
D) $75,000