Austin 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. Cost (in dollars) l l l l l l l l l l l l l l U 3' 5i} "; ill) l3; '7: \"'7 1m\"; :1; Iii] \"5 Illli iii I'll 1; Minutes used (per month) (a) If Austin makes 200 minutes of long distance calls for the month, which plan costs less? Plan A Plan B How much less does it cost than the other plan? W (b) For what number of long distance minutes do the two plans cost the same? [I If the time spent on long distance calls is less than this amount, which plan costs more? Plan A Plan B