A credit card bill due on April 5 showed a balance of $263. The card holder forgot to pay the bill until the 20th of the month, but paid the full amount of $263 at that time. In the mean time, the...

A credit card bill due on April 5 showed a balance of $263. The card holder forgot to pay the bill until the 20th of the month, but paid the full amount of $263 at that time. In the mean time, the card was used to make purchases of $138 on the 10th of the month and $74 on the 20th of the month. What was the average daily balance for the billing period?