Suppose you take on the Ipon Challenge and your savings must increase every week. You save ₱20 on the first week, then ₱50 on the next one, ₱80 on the 3rd week, and so on until the 52nd week. (a) How much will you have to save on the 29th week? (b) On which week will you have to save ₱980? (c) If there are 52 weeks in a year, how much will you be able to save for the entire year?