The hospital's laboratory costs include two components: $($a$)$ $$40,000$ per month for compensation of personnel and depreciation on equipment and $($b$)$ $$10$ per patient day for chemicals and other materials used in performing the tests.

Note: Base your second point on the total cost line on $4,000$ patient days and your point on $3,000$ patient days.

Cost ner manth $($In dnllam$)$

$$ll uays

Draw a graph or the cost behavio for each of the following costs incureed by the mountain summit. the hospital measures monthly acirvith in patient days