On the Discount Phoneline, any domestic long-distance call starting between 9 A  M  and 5 P  M  costs 15 cents a minute, and any other domestic long-distance call costs 10 cents a minute
So any domestic long-distance call on the Discount Phoneline that does not cost 10 cents a minute costs 15 cents a minute
If a university class involves extensive lab work, the class will be conducted in a laboratory; otherwise, it will be conducted in a normal classroom. Thus, if a university class is not conducted in a normal classroom, it will be conducted in a laboratory.