Final answer:
To determine how much each person should pay, divide the total bill by the number of people. For Chad and his friends, the amount is $23 each.
Step-by-step explanation:
When Chad went to dinner with four of his friends and the total bill came to $115, to find out how much each of them should pay, you simply divide the total bill by the number of people. In this case, there are 5 people (Chad and his four friends). So each person's share would be $115 divided by 5, which equals to $23 per person.