A stock broker followed the stock prices of a certain set of companies.
How much more did Houston Sporting Goods's stock cost on Tuesday than on Wednesday?
| Stock prices | ||
| Company | Tuesday | Wednesday |
| Watson and Partners | $7 | $1 |
| White and Company | $6 | $6 |
| Houston Sporting Goods | $15 | $2 |
| Thompson Corporation | $13 | $7 |
| Computer Data Company | $9 | $13 |
How much more did Houston Sporting Goods's stock cost on Tuesday than on Wednesday?
$
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