The opening balance of the January billing cycle for Megan's credit card was $4805. If she makes a new purchase of $300 on the 20th of January and doesn't make any payments, what is her average daily balance?
A. $5,105.23
B. $4,955.00
C. $4,805.00
D. $4,911.45
Assuming her billing cycle starts on the 1st of the month
(20 days x $4805 + 11 days ($4805 + $300) ) / 31 days = $ 4911.45