Jo's Mobile Plan: Fixed monthly charge = £16 Monthly 150 free minutes, post that 13p (or £0.13) per minute, Monthly 150 free texts, post that 15p (or £0.15) per text Jo's mobile phone usage details: 170 minutes of calls 182 texts Total Charges for Jo = Fixed Monthly Charge + Charges for Calls + Charges for Texts ⇒ Total Charges for Jo = 16 + (170-150) × 0.13 + (182-150) × 0.15 ⇒ Total Charges for Jo = 16 + (20) × 0.13 + (32) × 0.15 ⇒ Total Charges for Jo = 16 + 2.6 + 4.8 ⇒ Total Charges for Jo = 23.4 Hence, Jo should be charged £23.4 for the month.
