13 Parsley Corporation is a wholesaler that sells a single product and maintains a stable cost structure. Management has provided the following data. July 176 6,000 May June Selling price per unit 176 176 Sales units 4,000 7,000 Net operating income (Loss) 26,700 422,700 Gross margin 450,700 882,700 The best estimate of the margin of safety in July at the sales volume above is: $ 1,056,000 $ 968,000 $ 668,400 $ 387,600 Zero