QuestionThe United States Postal Service charges $\$ 0.55$ to mail a first-class letter that weighs up to 1 . ounce. Each additional ounce costs $\$ 0.15$. Which equation represents the situation? $y=0.15\lfloor x-1\rfloor 0.5$ $y=0.55\lfloor x-1\rfloor+0.15$ $y=0.55\lfloor x\rfloor+0.15$ $y=0.15\lfloor x\rfloor+0.55$