Stephanie kept track of the number of steps she took in the walk-a-thon. The average number of steps she took can be represented by the equation y=2500x. The table shows the number of steps Calvin walked each hour in a walk-a-thon. Hours Steps
2 4450
4 8900Which of the following statements is true?
Select one:

Calvin walked 550 more steps per hour.

Stephanie walked 275 more steps per hour.

Calvin walked 225 more steps per hour.

Stephanie walked 550 more steps per hour.