Aquatic Art, Inc. manufactures specialized, high-end, glass aquariums that are placed inside walls in homes and offices. The standard cost card for the bestselling small aquarium, which sells for $390 per unit (not including installation) is as follows: Penelope Pope, the operations manager, was reviewing the results for October when she became upset by some of the unfavorable variances she was seeing. She asked CFO Harvey Hinklestein for more information about the matter. He provided Penelope the following overhead budgets, along with actual results for October. The company purchased and used 125,000 pounds of sand to make the glass for the aquariums during the month. The sand used is fine and high quality, with a low melting temperature. Sand purchases during the month were made at $11.30 per pound. The direct labor payroll ran $3,048,250, with an actual hourly rate of $34.25 per DLH. The annual budgets were based on the production of 750,000 aquariums, using 1,125,000 direct labor hours. Though the budget for October was based on 62,000 aquariums, the company actually produced 58,000 aquariums during the month. Required: a. The standard cost for one aquarium b. Calculate the direct materials price and efficiency (usage) variances for October. c. Calculate the direct labor rate and efficiency variances for October. d. Calculate the variable overhead spending and efficiency variances for October. e. Which of these variances should Penelope be held responsible for? Why