Polio manufactures and sells $50$ control devices per day. Total fixed costs are

$$20,000$ per day and the total variable costs are $$10,000$ at this level of production.

Each control device is sold for $$800.$ Due to competition, demand for company's

control devices has started to decline.

Compute the amount of profit per unit if the daily volume of production and sales

drops by $20\%$ within relevant range? Carry up to two decimal points.

Example of Answer: $4\mathrm{.}67($No comma, space, or $ sign$)$