The following data apply to questions 4 and 5. Theta Company derived the following cost relationship from a regression analysis of its monthly manufacturing overhead cost. y = $80,000 + $12X where: y = monthly manufacturing overhead cost X = machine hours The standard error of estimate of the regression is $6,000. The standard time required to manufacture one six-unit case of Tory's single product is four machine hours. Theta applies manufacturing overhead to production on the basis of machine hours, and its normal annual production is 50,000 cases. 4. Theta's estimated variable manufacturing overhead cost for a month in which scheduled production is 10,000 cases would be a. $480,000. b. $320,000. C. $160,000. d. $80,000. 5. Theta's predetermined fixed manufacturing overhead rate would be a. $4.80/MH. b. $4.00/MH. C. $3.20/MH. d. $1.60/MH