?SG Co budgeted to make and sell 900 units of product M during September. The standard selling?price per unit of M is $27. At the beginning of September, a new competitor entered the market and?SG Co was forced to reduce the selling price in order to maintain sales volumes. By the end of?September, 900 units had been sold for a total of $18,000. In retrospect it is decided that a realistic?standard selling price for September, given the unexpected extra competition, was $18 per unit.?
Calculate the sales price planning variance.?
$ ______Adverse / Favourable (select the correct option)?