' Varex manufactures a single product called Varlux: a fashionable chair made with a very special kind of wood. This wood being quite expensive, Varex checks quite precisely the efciency of its production process. Varex has therefore collected the following information concerning wood consumption for last month production. - Purchasing price for the wood per kg (/kg) Total cost of wood () 1000 1122 ii If you can't see the image, please click on the link here. Compute the yield variance for wood consumption (if variance is positive write + before the number, if variance is negative write - before the number) +320