Задание по матиматике задание 877

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

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?