Three reputed cell phone companies are offering the latest model of iPhone for $399 if you sign a 2 year contract. For the same number of minutes and other features (such as texting and roaming) that are identical, the three companies (companies A, B and C respectively) charge $83 per month, $97 per month and $ 93 per month. On top of the monthly fees, 10% of the monthly service fee will be charged as surcharge and taxes. The total relevant costs for the decision of signing up for phone services for the three options are Company A Company B Company C A $ 8 $ 97 $ 9 B $ 8.30 $9.70 $9.30 C $399 $39 $399 D $91.30 $106.70 $102.30 E $490.30 $505.70 $501.30 O a. A O b. B O c.C O d. D O e. E