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04. SOLID Principles: Order Discount Calculator 04. SOLID Principles: Order Discount Calculator

Medium +25 Points

Deskripsi Tantangan Problem Description

Buat fungsi `calculateFinalPrice($subtotal, $membership)` dengan aturan: Jika membership `"PREMIUM"` berikan diskon 20%, jika `"MEMBER"` berikan diskon 10%, jika `"GUEST"` diskon 0%. Jika total setelah diskon >= 500000, berikan potongan tambahan flat Rp 25.000.

Create a function `calculateFinalPrice($subtotal, $membership)` with rules: PREMIUM gets 20% discount, MEMBER gets 10%, GUEST gets 0%. If total after percentage discount is >= 500,000, apply an extra flat 25,000 discount.

Example Test Cases

Input: [100000,"PREMIUM"]

Expected Output: 80000

Input: [600000,"MEMBER"]

Expected Output: 515000

<?php

function calculateFinalPrice(float $subtotal, string $membership): float {
    $rate = match(strtoupper($membership)) {
        'PREMIUM' => 0.20,
        'MEMBER' => 0.10,
        default => 0.0,
    };
    $discounted = $subtotal - ($subtotal * $rate);
    if ($discounted >= 500000) {
        $discounted -= 25000;
    }
    return $discounted;
}

solution.php