GreenTee.ts

class GreenTea extends Beverage {
  constructor() {
    super();
    this.description = "그린티~";
  }
  cost() {
    return 3500;
  }
}

class GreenTeaIce extends Beverage {
  constructor() {
    super();
    this.description = "아이스 그린티~";
  }
  cost() {
    return 4000;
  }
}