what is the monthly margin of safety in dollars if the business achieves its operating income goal?

J&A Corporation has a monthly target operating income of $18,000. Variable expenses are 10% of sales and monthly fod expenses are $18,000. What is the monthly margin of safety in dollars if the business achieves its operating income goal? O A $40,000 O B. $60,000 OC. $20,000 OD. $6,000