Gutsen Communications Inc. manufactures a scrambling device for cellular phones. The main component of the scrambling device is a very delicate part-DTV-12. DTV-12 requires careful handlings during manufacturing. Once damaged, the part must be discarded. Only skilled laborers are hired to manufacture and install DTV-12. Damages still occur, however. The following are the operating data of Gutsen Communications Inc. for 2018 and 2019 relative to the insertion of DTV-12. Number of phones manufactured Units of DTV-12 used Direct labor hours for DTV-12 insertion Total cost of DTV-12 units Direct labor wage rate per hour 2018 2019 690,000 789,000 1,189,655 1,080,000 2,550 3,425 $1,447,500 $2,337,500 $ 89.50 $ 112 The partial operational productivity ratio of DTV-12 in 2018 is: (Round calculations to 2 significant digits.) Multiple Choice 0.58 per unit. 0.68 per unit. 0 1.87 per unit. 2.95 per unit. O 3.28 per unit. 3.28 per unit