Question 277427
(t+h)^3=
t^3=.5^3=1/8
3t^2h=3*.5^2*.5=3/8
3th^2=3/8
h^3=1/8 
.
In 8 tries he spends 7000*8=56000
and wins 
20000 all tails
30000 2 tails
15000 one tail
------add
65000
.
65000-56000=9000 is the expected return after 8 tries
.
9000/8=RS 1125 expected return per try.
.
Ed