Abdul can choose Plan A or Plan B for his long distance charges. For each plan, cost (in dollars) depends on minutes used (per month) as shown below. Plan A ... . .. 20_L. Plan B Cost (in dollars) 10_ 80 100 120 140 160 180 200 220 240 260 280 300 Minutes used (per month) (a) If Abdul makes 120 minutes of long distance calls for the month, which plan costs more? X 5 O Plan A O Plan B How much more does it cost than the other plan? (b) For what number of long distance minutes do the two plans cost the same? 0 If the time spent on long distance calls is more than this amount, which plan costs less? O Plan A O Plan B