The following table was created to compare two cell phone plans, Plan A and Plan B. The monthly bill for each plan was computed based on the number of minutes used that month. While the actual monthly bills are not given, their differences are given in the last column. Minutes Plan A Plan B Plan A - Plan B 50 * * -10 100 * * -7.5 150 * * -5 200 * * -2.5 250 * * 0 300 * * 2.5 350 * * 5 400 * * 7.5 The first entry in the last column is -10. Which of the following statements explains what this tells you about Plan A and Plan B? i. The Plan B customer used the phone for 7frac(1,2) minutes less than the Plan A customer. ii. Plan A costs $10.00 more than Plan B for someone who uses 50 minutes. iii. The Plan A customer used the phone for 7frac(1,2) minutes less than the Plan B customer. iv. Plan B costs $10.00 more than Plan A for someone who uses 50 minutes