To calculate the sales potential for the target population of 80,000 18-34 year olds, we first need to determine the percentage of this age group that agrees with the statement 'I would buy this product'. From the data, 3 out of 30 respondents in the 18-34 age group agreed with the statement. The percentage is calculated as follows: (Number of people who agree / Total number of respondents) * 100 = (3 / 30) * 100 = 10%. Next, we apply this percentage to the total target population: Sales potential = Percentage * Total number of 18-34 year olds = 10% * 80,000 = 0.1 * 80,000 = 8,000. Therefore, the sales potential for this demographic is 8,000 people.