Kasey creates comedy sketch videos and posts them on a popular video website and is selling

an exclusive series of sketches on DVD. The total cost to make the series of sketches is $989.

The materials cost $1.40 per DVD and the shipping costs $2.00 per DVD. Kasey plans to sell

the DVDs for $12 each.

ALet d be the number of DVDs Kasey sells. Create a profit-peritem model from the given information by writing a rule for C(d), the total costs in dollars, S(d), the total sales income in dollars, P(d), the profit in dollars, and Ppi(d), the profit per item sold in dollars.