The second term in a geometric sequence is 50 . the fourth term in the same sequence is 112.5 . what is the common ratio in this sequence ?

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?