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he earn nth. cuz he sold it to the guy 9 bucks earn 1 dollar but when he buy it back with 10$he lost 1$.and when he sell it out when 11$ just got his money back !!he earn NOTHING they a raiseing the price up
2 bucks
$2 bucks la,
3 W$ m  J) J7 H) P- K3 dassume he has $9 at the beginning, minus $8 for the first purchase and sold it for $9, his balance should be $10, then he used $10 to purchase, the balance is $0, afterward, he got $11 back, his final balance would be $11, $11 - $9 = $2 in total
:onion31:
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:014: 1
:onion03:
1蚊:onion05:
我數學最差啦。。。。。。 3 蚊掛

2 Bucks

:sleeps:
2 buck law easy
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