7 In which of the following situations do the lists of numbers involved form an A P Give reasons for your answers i The fee charged from a student every month by a school for the whole session when the monthly fee is Rs 400 ii The fee charged every month by a school from classes I to XII when the monthly fee for class I is Rs 250 and it increase by Rs 50 for the next higher class iii The amount of money in the account of Varun at the end of every year when Rs 1000 is deposited at simple interest of 10 per annum