Apply Discount Every n Orders LeetCode solution in Java

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class Cashier {
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  private final int[] prices;
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  private final int n;
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  private final int discount;
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  private int customerNumber;
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  public Cashier(int n, int discount, int[] products, int[] prices) {
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    this.prices = new int[200];
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    for (int i = 0; i < products.length; ++i) this.prices[products[i] - 1] = prices[i];
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    this.n = n;
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    this.discount = discount;
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    this.customerNumber = 1;
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  }
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  public double getBill(int[] product, int[] amount) {
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    double sum = 0;
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    for (int i = 0; i < product.length; ++i) sum += this.prices[product[i] - 1] * amount[i];
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    if (this.customerNumber != 0 && this.customerNumber % n == 0)
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      sum *= (double) (100 - this.discount) / 100;
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    this.customerNumber++;
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    return sum;
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  }
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}
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/**
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 * Your Cashier object will be instantiated and called as such: Cashier obj = new Cashier(n,
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 * discount, products, prices); double param_1 = obj.getBill(product,amount);
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 */