Abicycle store costs $2,400 per month to operate. the store pays an average of $60 per bike. the average selling price of each bicycle is $120. how many bicycles must the store sell each month to break even?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?