Can you help me please

Until rocontly, hamburgers at the city sports arena cost $3.40 each. The food concessionaire sold an average of 4,000 harnburgers on game night When the price was. raised to $3.80, hamburgor sales dropped off to an average of 3,000 per night (a) Assurning a linear demand curve, find the price of a hamburger that will maximize the nightly hamburger revenue. (b) If the concessionaire had fixed costs of $1,000 per night and the variable cost is $0.70 per hamburger, find the price of a harmburger that wil maximze the nightly hamburger profit. (a) Assuming a linear demand curve, find the price of a hamburger that will maximize the nightly hamburger revenue. The hamburger price that will maximize the nighty hamburger revenue is $ (Round to the nearest cent as needed) The average ticket price for a concert at the cpera house was $25. The average attendance was 3000 . When the ficket price was raised to $28, attendance declined to an average of 2700 persons per performance. What should the ticket prico bo to masimize revenve for the opora house? (Assume a linear dermand curve) To maximize revenue, the price should be i per ticket. (Type an intoger of decimal rounded to two decimal places as needed. Simplify your answer.)