stock, 1000 in, even days is falling 20%, odd days is up 20%, how much remains after 30 days?
Call A the beginning amount......assuming a 30 day month.....
So....the amount left at the end of the month =
A (1.20)^15 * (.80)^15 = about .542A
[In other words, about 54.2% of the original amount remains]
