MI: 200 tickets, once chance ticket, % = 100
SS: 0.5% of winning one ticket.
b) How many tickets would you need to purchase to have a 2.5% chance of winning ?
MI: 200 tickets, one chance ticket, %= 100, two tickets of winning.
SS: You need two more tickets to have a chance of winning 2.5%.
( If I made any mistakes, just tell me and I'll work on it. :) )