ASAP Please! Especially Part 2

Solve the problems below that pertain to the profit from the sale of items.
(a) Marketing tells you that if you set the price of an item at $10 then you will be unable to sell it, but that you can sell 540 items for each dollar below $10 that you set the price. Suppose your fixed costs total $2000, and your marginal cost is $2 per item. What is the most profit you can make?
$_____when the price is _____$ .

(b) How are your answers to the problem affected if the cost per item for the x items, instead of being simply $2, decreases below $2 in proportion

Question

ASAP Please! Especially Part 2

Solve the problems below that pertain to the profit from the sale of items.
 (a) Marketing tells you that if you set the price of an item at $10 then you will be unable to sell it, but that you can sell 540 items for each dollar below $10 that you set the price. Suppose your fixed costs total $2000, and your marginal cost is $2 per item. What is the most profit you can make?
 $_____when the price is _____$ .
 
(b) How are your answers to the problem affected if the cost per item for the x items, instead of being simply $2, decreases below $2 in proportion