A Lighthouse That Serves a Dangerous Coastal Area Is Built

Multiple Choice

A lighthouse that serves a dangerous coastal area is built. The lighthouse cost $500,000 to build and serves 500 ships a month. If the shipping in the area increases so that 750 ships pass by a month, the increase in additional costs of providing the light to these new ships is

A) $500,000.
B) $250,000.
C) $250.
D) $0.