Metal Shelf Company$$s standard cost for raw materials is $$4\mathrm{.}00$ per pound and it is expected that each metal shelf uses two pounds of material. During October Year $2,25,000$ pounds of materials are purchased from a new supplier for $$97,000$ and $13,000$ shelves are produced using $27,000$ pounds of materials. Which statement is a possible explanation concerning the direct materials variances?