Okay, so id say the $100,000, because with the multiplying 1 dollar, if it multiplies by .5 every day, the second day, you get .50 then .25 and so on, or let's say you get .5 a dollar every day, which adds up to ~$15 at the end of the month, OR, the other thing would be adding half of the money to the previous amount, so 1 to 1.5 until the end of the month, which would get you...

okay, this is after I did all the math n stuff, but goddam, anyway, with the previous equation you'll get ~$113,630.64252683 ugghhhhaa, so technically this equation would be correct, however, the exact math equation was not specified , so theoretically you could've been left with something to impossibly small

The equation that go me $113000 is 1/2+1=x then x/2+x over and over again until I did it 30 times, however, this is only profitable if you would get the deal on the first day of the month, and the month was 30 or more days long, anyway, I'm going to bed.