You are upgrading your smartphone and need to update your plan. The flat rates for the plan are listed below. Amounts over the maximum allowable gigabytes (GB) for each plan are charged $15 per GB, fractional amounts included. You estimated that with the phones new features you will use 10 GB, which does not align directly with any plan.
Plan Base Price Max # of GB
A $60 5GB
B $85 7GB
C $140 12GB
D $150 15GB
If you use 10 GB of data which plan should you choose?
At what level of usage should you upgrade from Plan B to Plan C?
At what Level of usage should you upgrade from Plan C to Plan D?
Summarize the decision rules for choosing each plan.