Maggie Ryan is pricing materials for a deck project. She notes that deck
boards are sold in standard lengths by the foot as follows: 6 feet for
$5.88, 8 feet for $8.79, 10 feet for $10.68, 12 feet for $13.43, 14 feet for
$15.65, 16 feet for $17.88, 18 feet for $20.99, and 20 feet for $24.99. What
is the price per foot for each length?