Credit Cards · Example 2

The billing cycle goes from May 1 to May 31. The balance at the start of the billing cycle is $450.21. The list of transactions on the card is below.

\begin{array}{|c|c|c|}\hline \text{Date} & \text{Activity} & \text{Amount} \\ \hline \text{1-May} & \text{Billing Date Balance} & \text{$450.21} \\ \hline \text{10-May} & \text{Payment} & \text{$120.00} \\ \hline \text{15-May} & \text{Groceries} & \text{$83.43} \\ \hline \text{26-May} & \text{Auto Parts} & \text{$45.12} \\ \hline \text{26-May} & \text{Restaurant} & \text{$85.34} \\ \hline \text{30-May} & \text{Shoes} & \text{$98.23} \\ \hline\end{array}
Find the average daily balance for the credit card during the month of May.

OpenStax, Contemporary Mathematics · §6.10 Credit Cards · Example 2