the soccer world cup is happening later this fall. during the tournament, 64 games will be played and I plan to place bets in all of them. each bet is handicapped by a goal spread so that the probability I win any individual bet is 50%.

Every win gets me $100 and every loss costs $105 as I need to pay a fee for the betting company.

what is the probability (approximately) that i make money by the end of the cup?

a. 42%

b. 72%

c. 26%

d. 52%