A student decides to save money every week. He puts aside Rs 50 in the first week and then increases the amount saved by Rs 7 each successive week.
(i) List the amounts he will save in each of the first eight weeks.
(ii) If the same pattern is extended backwards, what amounts would correspond to week 0 and week −1? State the reasoning briefly.
(iii) How much will he save in the 20th week?
(iv) In which week will the weekly saving amount first reach or exceed Rs 300? Show all working clearly.