Use the Information Below to Answer the Following Question(s)

Use the information below to answer the following question(s) .
Southwest Electric Co-op has variable expenses of 20% of sales and monthly fixed expenses of $150,000. The monthly target operating income is $50,000.
-What is the monthly margin of safety in dollars if Southwest Electric Co-op achieves its operating income goal?

A) $125,000
B) $437,500
C) $250,000
D) $62,500