Incremental Division [Almost there]

I have hours in columns extended out several years by month. For this example it starts at A1. In another spreadsheet I have those months split with 2 dates for every month. What I need to do is to come up with a formula that will allow me to divide each month evenly to spread across the 2 dates for the correlating month on the spreadsheet with two dates for each month. I have hundrunds of line items that span over 10 years so a formula will help tremendously. Also, if someone has a better recommendation for a title of this thread please let me know.


January-12 February-12 March-12 April-12
100 100 100 100
1/8/2012 1/26/2012 2/10/2012 2/23/2012 3/6/2012 3/20/2012 4/10/2012 4/28/2012
50 50 50 50 50 50 50 50