Ball-Mart, a baseball card store, had a 1968 Nolan Ryan rookie card in almost

perfect condition for sale. Any baseball collector would have known that the

card was worth at least $1,000; the published monthly price guide listed its

market value at $1,200. Bryan was a 12-year-old boy with a collection of over

40,000 baseball cards. When Bryan went to Ball-Mart, Kathleen, who knew

nothing about cards, was filling in for the owner. The Ryan card was marked

"1200", so Bryan asked Kathleen if this meant 12 dollars. She said yes and

sold it to him for that amount. When Ball-Mart's owner realized the mix-up, he

sued to rescind the contract. Who wins?