Boris and Amy have their phones set to show the percent of battery life they have left, but
not the minutes. Borla's phone typically lasts for 480 minutes when it is fully charged, and
Amy's typloally lasts for 540 minutes when it is fully charged, Borla's phone shows that he
has 45% of his battery life remaining, and Amy'e phone shows that she has 40% of her
battery life left. Who has more time left before their phone battery died? Explain.