If the day of effective filing is October 23rd, the correct fraction is 9/ 31. That
is, including October 23rd, there are 9 benefit days in October and 31 calendar days
in October. To find the prorated benefit, multiply the unprorated benefit by the number
of benefit days (the first number in the fraction)(9 for October 23rd) and divide
the result by the number of days in the month (the second number in the fraction)(31
for October).