A trainee teacher receives a salary that starts at ₹18000 in April and increases by ₹750 every month. The financial year is taken from April to the following March (12 months in all).
(i) Express the salary for the nth month (April taken as n=1) in terms of n.
(ii) In which month of the financial year will the salary first exceed ₹24000?
(iii) For how many months in the same financial year will the salary remain below ₹30000?
(iv) Calculate the total salary drawn by the trainee during this financial year.