An employee receives a monthly bonus that increases by a fixed amount each month. The first month’s bonus is ₹800 and each subsequent month it rises by ₹50.
(i) How much bonus will the employee receive in the 18th month?
(ii) Find the total bonus received during the first 18 months.
(iii) Determine the least number of months after which the employee's cumulative bonus will exceed ₹30,000. Show all steps of your calculation.