The following is last month's contribution format income statement:
Sales (15,000 units)........$1,500,000
Variable expenses........... 900,000
Contribution margin......... 600,000
Fixed expenses.............. 500,000
Net operating income........ 100,000
What is the company's margin of safety in dollars?
a.$600,000
b.$100,000
c.$250,000
d.$1,500,000