Botella Inc. produces plastic bottles. Each bottle has a standard labor requirement of 0.023 hours. During the month of April, 502,000 bottles were produced using 13,900 labor hours @ $9.75. The standard wage rate is $8.75 per hour. Required: Calculate the labor rate and efficiency variances using the columnar and formula approaches. If required, round your answers to the nearest cent. Labor rate variance Labor efficiency variance $ Favorable Unfavorable