On Jetstar flights, passengers have to pay extra for food and drinks. Assume the only product that Jetstar sells on the plane is packets of potato chips. Each packet costs Jetstar $4 (hint: the marginal cost is constant at $4 per packet). Currently Jetstar charges $4.50 for a packet of chips. Below is a table of potential prices Jetstar could charge and the corresponding quantities.

Price ($/packet)	Quantity (packets)
6.50	30
6.00	42
5.50	56
5.00	72
4.50	92
4.00	105

Answer the following questions:

1. What is Jetstar's marginal revenue when the price is $4.50 per packet?Answer to the nearest twodecimal places.$ per packet.
2. At a price of $4.50 per packet, should Jetstar decrease or increase the packets of chips sold to maximise profit? . Type D for Decrease or I for Increase.
3. Calculate Jetstar's profit-maximising quantity of packets to sell. Answer to the nearest whole number (with no decimal places). packets.