Bonzo went to a carnival. at the first
game, he paid 10¢ to get in, spent half
the money he had left, and spent 10¢
to get out. at the second game, he
spent 10¢ to get in, spent half the
money he had left, and spent 10¢ to
get out. at the third game, he spent
10¢ to get in, spent half the money he
had left, and spent 10¢ to get out.
then he found he had no money left.
how much money did bonzo start with?