export class Item {
  constructor(price) {
    this.price = price;
  }
  get tax() { throw "not implemented"; }
  get subtotal() { return this.price + this.tax; }
}

export class AlcoholicBeverage extends Item {
  get tax() { return this.price * 0.25; }
}

export class NormalFood extends Item {
  get tax() { return 0; }
}

export class NonFood extends Item {
  get tax() { return this.price * 0.0825; }
}