Please help quickly I will give as many points as I can!!

The average cost of a pickup truck at a certain dealership over the last 10 years has ranged from $25,000
to $30,500. Suppose you were going to plot these points on a coordinate grid.
(a) What is a good scale to use for the y-axis? Explain your reasoning.
(b) What is a good interval to use for the y-axis? Explain your reasoning.