6. (20 pts) The graph below shows the marginal cost, C'(x), in dollars per item for producing a certain number of items. (Hint: Remember to include units.) 40 dollars per item 30 20 10 number of items 100 200 300 400 @a. Find the total cost (from the beginning) if you are making 300 items. Round to the 100th @b. Find the change in the total cost if you increase from making 300 items to 500 items. Round to the 100th. @c. Find the total cost (from the beginning) if you are making 500 items. Round to the 100th d. Circle one answer. As production increases from 200 to 300 items, the total cost is increasing, decreasing, or stable