A producer of a single product had the following results for the year just ended: Unit Sales Margin of Safety in Units Net operating income 6,210 units 263 units 6,575 How much was fixed cost for the year? (All answers are whole numbers -- unless specified otherwise. You should NOT include the $ sign or a comma. E.g., you should type 1000 for one thousand. Negative numbers should be added with a minus sign, e.g., -1000 for a decrease or loss of one thousand.) Fixed cost =$