Strathcona Polyoontainers manufactures plastic rain barrels. At the start of May 2023, the following budgeted amounts (based on a standard cost system) related to the manufacture of one unit of its econo-barrel: Required: 1 Determine the direct material price and usage varlances. Indicate whether favorable of unf: Direct material price variance: Direct material usage variance: 2 Identify two possible causes for each of the variances determined