We ignore the first row, and focus on the second row only, because we're told that they did not stay at the beachfront resort.
We have 0.05 of the entire sample visit St Lucia in the second row out of 0.17 total for that row. This leads to 0.05/0.17 = 0.29 approximately. There's roughly a 29% chance of someone visiting St Lucia given they stayed in a condo.
If you wanted, you can move the decimal point 2 spots to the right for every value in the table. That would mean of the 17 people who stayed in a condo, 5 of them visited St Lucia. So 5/17 = 0.29
