To be honest i really think it is simple and easy .

All we have is 400,000 MARI daily and that is a fixed number never change  (increasing  or decreasing) . Those 400,000 MARI is divided by the number of total claims by the end of the day .

And that determines how much every claim worth of MARI at the end of the day.

so your shares from the 400,000 is simply  . Number of your claims at the end of the day * ( 400,000/total claims at the end of the day ) = the amount of MARI u get at the end of the day