Final answer:
To find the cost for one person to catch the bus, divide the total cost of $31.05 by the number of friends, which is 9, resulting in a cost of $3.45 per person.
Step-by-step explanation:
To calculate the cost for one person to catch the bus into town when 9 friends share a total cost of $31.05, you divide the total cost by the number of friends. The formula is as follows:
Cost per person = Total cost ÷ Number of people
Inserting the given numbers:
Cost per person = $31.05 ÷ 9
Cost per person = $3.45
So, it costs $3.45 for one person to catch the bus into town.