2 experts told me 19 and 20.50 and those answers are not right

George Galoz \& Freres, located in Grenchen, Switzerland, makes luxury custom watches in small lots; One of the company's products, a platinum diving watch, goes through an etching process. The company has recorded etching costs: as follows over the last six weeks: For plaming purposes, management would like to know the variable ectching cost per unit and the total fixed efchling cost perweek 3. If the campany processers five units next week, what would be the expected total etching cost? (Round your intermediate calculations and finol answer to 2 decimal plocen.)